NCERT Economics (Class 9–12) Cheatsheet

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Microeconomics

CLASS 11

What is Economics?

DefinitionEconomics is the study of how society allocates scarce resources among unlimited wants

ScarcityFundamental economic problem — resources (land, labour, capital, entrepreneurship) are limited but human wants are unlimited

ChoiceDue to scarcity, society must choose what to produce, how to produce, and for whom to produce

Opportunity CostThe value of the next best alternative foregone when a choice is made. E.g., if you study economics, the opportunity cost is the history class you gave up

Marginal AnalysisDecisions made by comparing marginal benefit (MB) with marginal cost (MC); if MB > MC, do it

Positive EconomicsFact-based, objective statements — "India's GDP grew 7.2% in 2023"

Normative EconomicsOpinion-based, subjective statements — "The government should increase spending on education"

Central Problems of an Economy

Problem	Description	Example
What to produce?	Allocation of resources between goods & services — consumer goods vs capital goods; military vs civilian	More tractors vs more cars; schools vs hospitals
How to produce?	Choice of technology — labour-intensive vs capital-intensive	Handloom weaving (labour) vs power loom (capital)
For whom to produce?	Distribution of output among different sections of society	Luxury goods for rich vs food grains for poor

Production Possibility Curve (PPC)

DefinitionA curve showing various combinations of two goods an economy can produce with given resources & technology, assuming full & efficient utilisation

ShapeConcave to origin (bowed outward) — due to increasing marginal opportunity cost (resources are not equally efficient in producing both goods)

Points on PPCEfficient — all resources fully utilised (attainable & efficient)

Points inside PPCInefficient — underutilisation of resources (attainable but inefficient)

Points outside PPCUnattainable with current resources & technology

Rightward shiftEconomic growth — increase in resources or technological improvement

Leftward shiftDecrease in resources — natural calamity, war, depletion

MRT (Marginal Rate of Transformation)Amount of Good Y sacrificed to produce one more unit of Good X = ΔY / ΔX

Types of Economies

Feature	Market Economy	Planned Economy	Mixed Economy
Ownership	Private ownership of resources	State ownership of resources	Both private & state ownership
Decision making	Price mechanism (demand & supply)	Central planning authority	Both market & planning
Examples	USA, UK (mostly)	North Korea, Cuba (formerly USSR)	India, China, France
Consumer sovereignty	High — consumers decide production	Low — state decides	Moderate
Inequality	May be high	Low in theory	Moderate
Efficiency	Generally efficient	Often inefficient (bureaucracy)	Balanced approach
Economic problem solved by	Market forces (price)	Planning commission	Both market & planning

Consumer Behaviour — Utility Analysis

Concept	Cardinal Utility	Ordinal Utility
Approach	Utility is measurable in numbers (utils)	Utility is rankable (preferred more/less)
Pioneer	Alfred Marshall	J.R. Hicks & R.G.D. Allen
Measurement	Numerical — e.g., 10 utils, 20 utils	Ranking — 1st, 2nd, 3rd preference
Key tool	Total Utility (TU), Marginal Utility (MU)	Indifference Curve, Budget Line
Law	Law of Diminishing Marginal Utility	Diminishing Marginal Rate of Substitution (MRS)
Equilibrium	MUx/Px = MUy/Py = MU of money	MRSxy = Px/Py (tangency of IC & BL)

Law of Diminishing Marginal Utility

StatementAs a consumer consumes more and more units of a commodity, the additional satisfaction (MU) from each successive unit goes on decreasing

AssumptionsRational consumer, constant MU of money, homogeneous units, continuous consumption, no change in tastes

RelationshipMU(n) = TU(n) − TU(n−1); TU increases at a diminishing rate; TU is max when MU = 0; TU starts falling when MU is negative

ExceptionAddictive goods, hobbies, initial units (e.g., first few coins of a collection)

Consumer Equilibrium (Cardinal Approach)

Single commodityConsumer equates MU of commodity (in utils) with its price in money terms: MUx/Px = MUm (marginal utility of money)

Two commoditiesLaw of Equi-Marginal Utility: MUx/Px = MUy/Py = MUm; consumer allocates income so that last rupee spent on each good gives same satisfaction

ConditionSpending on each good must equal consumer's income: Px × Qx + Py × Qy = M (budget)

Indifference Curve Analysis (Ordinal Approach)

DefinitionA curve showing all combinations of two goods that give the consumer equal satisfaction (same utility level)

Slopes downwardMore of Good X means less of Good Y to maintain same satisfaction level

Convex to originDue to diminishing MRS — as consumer gets more of X, they are willing to give up less of Y

Higher IC = Higher satisfactionA consumer always prefers a higher indifference curve to a lower one

ICs cannot intersectIf they did, it would violate the assumption of consistent preferences (transitivity)

MRSxyMarginal Rate of Substitution = |ΔY/ΔX| = MUx/MUy — the rate at which consumer substitutes X for Y

Budget LineShows all combinations of two goods a consumer can buy with given income: M = Px·X + Py·Y

BL slope= −Px/Py (negative, ratio of prices)

Shift of BLRightward if income increases; changes slope if price of one good changes

Equilibrium conditionIC tangent to Budget Line: MRSxy = Px/Py = MUx/MUy

Demand — Law of Demand & Determinants

Law of DemandOther things remaining constant (ceteris paribus), quantity demanded of a good is inversely related to its price — as price rises, demand falls

Demand curveDownward sloping (left to right) — inverse relationship between price & quantity

Reasons for downward slopeLaw of diminishing MU, income effect (real purchasing power changes), substitution effect (cheaper alternatives), multiple uses of goods, consumers at different income levels

Exceptions (upward demand curve)Giffen goods (inferior staple — bread, potatoes), Veblen goods (conspicuous consumption — luxury brands), expectations of further price rise, necessities in emergencies

Individual demandQuantity demanded by a single consumer at various prices

Market demandHorizontal summation of all individual demand curves

Determinants of Demand

Factor	Effect on Demand	Type
Price of the good itself	Inverse relationship (law of demand)	Movement along the curve
Price of related goods (substitutes)	Direct — if price of tea ↑, demand for coffee ↑	Shift of curve
Price of related goods (complements)	Inverse — if price of petrol ↑, demand for cars ↓	Shift of curve
Consumer income (normal goods)	Direct — more income, more demand	Shift of curve
Consumer income (inferior goods)	Inverse — more income, less demand	Shift of curve
Tastes & preferences	Favourable change → demand ↑	Shift of curve
Population size	More people → more demand	Shift of curve
Expectations of future prices	Expect price ↑ → buy more now → demand ↑	Shift of curve

Elasticity of Demand

DefinitionMeasure of responsiveness of quantity demanded to a change in any of the determinants (price, income, price of related goods)

Price Elasticity (Ed)Ed = % change in Qty demanded / % change in Price = (ΔQ/Q) / (ΔP/P) = (ΔQ/ΔP) × (P/Q)

Income Elasticity (Ey)Ey = % change in Qty demanded / % change in Income — positive for normal goods, negative for inferior goods

Cross Elasticity (Exy)Exy = % change in Qty of X / % change in Price of Y — positive for substitutes, negative for complements

Types of Price Elasticity of Demand

Type	Ed Value	Meaning	Demand Curve Shape
Perfectly elastic	Ed = ∞	Consumer buys infinite qty at one price, nothing above it	Horizontal line
Relatively elastic	Ed > 1	% change in Qd > % change in Price	Flatter curve
Unitary elastic	Ed = 1	% change in Qd = % change in Price	Rectangular hyperbola
Relatively inelastic	Ed < 1	% change in Qd < % change in Price	Steeper curve
Perfectly inelastic	Ed = 0	Quantity demanded does not change at all	Vertical line

Factors Affecting Price Elasticity of Demand

Factor	High Elasticity (Ed > 1)	Low Elasticity (Ed < 1)
Availability of substitutes	Many substitutes available	Few or no substitutes
Nature of good	Luxury goods	Necessities
Proportion of income	Takes large share of income	Takes small share of income
Time period	Long run (more time to adjust)	Short run (urgent needs)
Number of uses	Commodity with many uses	Commodity with single use
Habits	Non-habitual consumption	Habitual consumption (cigarettes, alcohol)

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Remember: The Total Expenditure Methodis useful for practical analysis — if price falls and total expenditure rises, demand is elastic (Ed > 1). If expenditure remains the same, Ed = 1. If expenditure falls, Ed < 1. Also remember: slope of demand curve ≠ elasticity — steeper slope means less elastic, but elasticity varies along a straight-line demand curve.

Producer Behaviour — Production Function

Production functionTechnical relationship between inputs and output: Q = f(L, K) where Q = output, L = labour, K = capital

Short runAt least one input is fixed (usually capital) — law of variable proportions applies

Long runAll inputs are variable — returns to scale apply

TP (Total Product)Total output produced with given inputs

AP (Average Product)AP = TP / L — output per unit of variable input

MP (Marginal Product)MP = ΔTP / ΔL — additional output from one more unit of input

RelationMP rises, reaches max, then falls; AP rises when MP > AP, AP falls when MP < AP; AP = MP when AP is at maximum; TP is max when MP = 0

Law of Variable Proportions (Short Run)

StatementAs more and more units of a variable factor are combined with a fixed factor, MP first increases, reaches a maximum, then diminishes and may become negative

AssumptionsOne factor fixed, technology constant, homogeneous variable factor, no change in fixed factor

Stage I: Increasing returnsTP increases at increasing rate, MP rises, AP rises — underutilisation of fixed factor

Stage II: Diminishing returnsTP increases at diminishing rate, MP falls (positive but decreasing), AP falls — ideal stage for producer

Stage III: Negative returnsTP falls, MP becomes negative — over-utilisation of fixed factor; producer never operates here

Returns to Scale (Long Run)

Type	When	Result
Constant Returns to Scale	Inputs ↑ by n%, Output ↑ by n%	Q(nL, nK) = n·Q(L, K); economies & diseconomies balance
Increasing Returns to Scale	Inputs ↑ by n%, Output ↑ by more than n%	Economies of scale dominate — specialisation, division of labour
Decreasing Returns to Scale	Inputs ↑ by n%, Output ↑ by less than n%	Diseconomies of scale dominate — managerial inefficiency, coordination problems

Cost — Short Run & Long Run

Cost Concept	Formula / Description
Total Fixed Cost (TFC)	Does not change with output — rent, interest on fixed capital, salaries of permanent staff
Total Variable Cost (TVC)	Changes with output — raw materials, wages of casual labour, power, fuel
Total Cost (TC)	TC = TFC + TVC
Average Fixed Cost (AFC)	AFC = TFC / Q — always falls as output increases (rectangular hyperbola)
Average Variable Cost (AVC)	AVC = TVC / Q — U-shaped (first falls, then rises due to law of variable proportions)
Average Total Cost (ATC/AC)	AC = TC / Q = AFC + AVC — U-shaped
Marginal Cost (MC)	MC = ΔTC / ΔQ = ΔTVC / ΔQ (since ΔTFC = 0) — U-shaped; MC curve passes through minimum of AVC and ATC

Relationship Between Cost Curves

MC & AVCMC curve cuts AVC at its minimum point; when MC < AVC, AVC falls; when MC > AVC, AVC rises

MC & ACMC curve cuts AC at its minimum point; same logic as MC-AVC relationship

AFC & ACAC > AVC always (by AFC amount); gap narrows as output increases since AFC falls

Long run ACEnvelope of all short run AC curves — U-shaped due to economies & diseconomies of scale

Revenue — TR, AR, MR & Profit Maximisation

Revenue Concept	Formula / Description
Total Revenue (TR)	TR = P × Q (Price × Quantity sold)
Average Revenue (AR)	AR = TR / Q = Price per unit — AR curve IS the demand curve
Marginal Revenue (MR)	MR = ΔTR / ΔQ — additional revenue from selling one more unit
Under perfect competition	AR = MR = Price (horizontal demand curve)
Under monopoly	AR is downward sloping, MR < AR (MR falls faster)

Profit Maximisation — MR = MC Rule

Condition 1MR = MC (equilibrium condition — marginal revenue equals marginal cost)

Condition 2MC must be rising (cuts MR from below — second order condition for stability)

Profitπ = TR − TC; when TR > TC, supernormal profit; TR = TC, normal profit (breakeven); TR < TC, loss

Shut-down pointIn short run, firm shuts down if P < AVC (cannot cover variable costs); continues if P ≥ AVC (covers at least variable costs and some fixed costs)

Market Forms — Comparison

Feature	Perfect Competition	Monopoly	Monopolistic Competition	Oligopoly
Number of firms	Very large (infinite)	Single firm	Many firms	Few firms
Product differentiation	Homogeneous (identical)	Unique (no close substitute)	Differentiated	May be homogeneous or differentiated
Price control	Price taker (no control)	Price maker (full control)	Partial price maker	Strategic interdependence
Entry/exit	Free entry & exit	Blocked entry	Free entry & exit	Difficult entry (barriers)
Demand curve	Horizontal (AR = MR = P)	Downward sloping (MR < AR)	Downward sloping (MR < AR)	Kinked demand curve (Sweezy model)
Example	Agricultural produce	Electricity board, railways	Restaurants, soaps, toothpaste	Automobiles, cement, telecom
Efficiency	Both productive & allocative	Neither productive nor allocative	Excess capacity (neither)	Varies; may have collusion

Perfect Competition — Equilibrium

Short-run equilibriumFirm produces where MR = MC = P (given by market); may earn supernormal profit, normal profit, or loss depending on whether P > AC, P = AC, or P < AC

Long-run equilibriumFree entry/exit ensures only normal profit (P = AC minimum); zero economic profit

Supply curve of firmPortion of MC curve above AVC minimum (shut-down point)

Market supplyHorizontal summation of all firms' supply curves

Monopoly & Price Discrimination

Sources of monopolyLegal barriers (patents, licences), natural monopoly (high fixed costs, economies of scale), control of raw materials, aggressive tactics

RevenueAR = Demand curve (downward sloping), MR < AR and falls faster; TR rises, max, then falls

EquilibriumMR = MC; price determined on demand curve (P > MC — price maker); earns supernormal profit in both short and long run

Price discriminationCharging different prices to different consumers for the same product

Degrees of PD1st degree: each unit at different price; 2nd degree: block pricing (bulk discounts); 3rd degree: different prices for different market segments

Conditions for PDMarket power, different price elasticities, no resale between segments, identifiable groups

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Exam tip: For market forms, remember the mnemonic PHMO — Perfect competition, Monopoly, Monopolistic competition, Oligopoly. The key differentiators are: number of firms, product nature, price control, and barriers to entry. Always draw the AR/MR curves for each market form.

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Macroeconomics

CLASS 12

National Income — Key Concepts

Concept	Definition	Formula
GDP (Gross Domestic Product)	Market value of all final goods & services produced within the domestic territory of a country in a year	GDPmp = C + I + G + (X − M)
GNP (Gross National Product)	GDP + Net Factor Income from Abroad (NFIA)	GNPmp = GDPmp + NFIA
NDP (Net Domestic Product)	GDP − Depreciation	NDPmp = GDPmp − Depreciation
NNP (Net National Product)	GNP − Depreciation = National Income	NNPfc = NNPmp − Net Indirect Taxes (= NI)
Nominal GDP	GDP at current market prices	Uses current year prices
Real GDP	GDP at constant (base year) prices	Uses base year prices — reflects true growth
GDP Deflator	Ratio of Nominal to Real GDP × 100	GDP Deflator = (Nominal GDP / Real GDP) × 100
Per Capita Income	National Income / Total Population	Average income per person

Methods of Measuring National Income

Method	Description	Formula / Approach
Value Added Method (Product Method)	Sum of value added by all producing units in the economy. Value Added = Value of Output − Intermediate Consumption	GDP = Σ(Gross Value Added) + Net Indirect Taxes
Income Method	Sum of all factor incomes (wages, rent, interest, profit) earned by residents	NDPfc = Compensation of Employees + Operating Surplus + Mixed Income
Expenditure Method	Sum of final expenditures on goods & services produced in the economy	GDPmp = C (consumption) + I (investment) + G (govt) + (X − M) (net exports)

Important National Income Identities

GDPmp = GVA at MP + Net Indirect TaxesGVA = Value of Output − Intermediate Consumption

GVA at FC = GVA at MP − Net Indirect TaxesNet Indirect Taxes = Indirect Taxes − Subsidies

NNPfc = National IncomeNNPfc = NDPfc + NFIA = NNPmp − Net Indirect Taxes

Personal IncomeNI − Undistributed Profits − Corporate Tax − Net Interest Payments + Transfer Payments

Disposable IncomePersonal Income − Personal Direct Taxes

GDPmp = C + I + G + (X − M)Aggregate demand in a closed economy: GDP = C + I + G

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Key: While calculating national income, avoid double counting! Use only final goods or the value-added method. Items excluded: second-hand goods, purely financial transactions, transfer payments (pensions, scholarships), intermediate goods, illegal activities.

Circular Flow of Income

Two-sector modelHouseholds and Firms — households supply factors to firms, firms pay factor incomes; firms supply goods to households, households pay consumption expenditure

LeakagesSavings (S), Taxes (T), Imports (M) — money withdrawn from circular flow

InjectionsInvestment (I), Government spending (G), Exports (X) — money added to circular flow

Equilibrium conditionLeakages = Injections, i.e., S + T + M = I + G + X

Determination of Income & Employment

Aggregate Demand (AD)Total demand for goods & services in the economy: AD = C + I + G + (X − M); in a simple two-sector: AD = C + I

Aggregate Supply (AS)Total supply of goods & services: AS = C + S; AS curve is 45° line (income = output)

EquilibriumWhere AD = AS (or planned investment = planned saving); also where S = I

Consumption FunctionC = a + bY — where a = autonomous consumption (Y=0), b = MPC (slope), Y = income

Saving FunctionS = −a + (1−b)Y — where (1−b) = MPS; S = Y − C

Propensity to Consume & Save

Concept	Definition	Value Range
MPC (Marginal Propensity to Consume)	ΔC / ΔY — ratio of change in consumption to change in income	0 < MPC < 1
MPS (Marginal Propensity to Save)	ΔS / ΔY — ratio of change in saving to change in income	0 < MPS < 1
APC (Average Propensity to Consume)	C / Y — ratio of total consumption to total income	APC > MPC; APC falls as income rises
APS (Average Propensity to Save)	S / Y — ratio of total saving to total income	APS < MPS; APS rises as income rises

Key relationshipsMPC + MPS = 1; APC + APS = 1; APC > MPC (always, because autonomous consumption exists)

Investment Multiplier

Multiplier (k)k = 1 / (1 − MPC) = 1 / MPS

MeaningRatio of change in income to change in investment: k = ΔY / ΔI

ProcessAn initial increase in investment leads to a chain of increased consumption → increased income → more consumption, etc.

ExampleIf MPC = 0.8, k = 1/0.2 = 5; an investment of ₹100 crore → income increase of ₹500 crore

If MPC = 0k = 1 (no multiplier effect — entire income saved)

If MPC = 1k = ∞ (maximum multiplier — entire income spent)

Full Employment & Unemployment

Full employmentWhen all willing and able people are employed; does not mean zero unemployment (natural rate exists)

Involuntary unemploymentWorkers willing to work at current wage but cannot find jobs — AD < AS

Deficient demandAD < AS at full employment → deflationary gap → output falls, unemployment rises

Excess demandAD > AS at full employment → inflationary gap → prices rise (demand-pull inflation)

Money — Functions & Supply

Function	Description
Medium of exchange	Eliminates the double coincidence of wants; facilitates transactions
Measure of value / Unit of account	Common measure of value; prices expressed in money terms
Store of value	Can be saved and used for future purchases (money is most liquid store of value)
Standard of deferred payments	Borrowing/lending and future payments denominated in money

Measures of Money Supply (India)

Measure	Components	Description
M1 (Narrow Money)	Currency (C) + Demand Deposits (DD) + Other Deposits with RBI	Most liquid form of money; high velocity
M2	M1 + Post Office Savings Bank Deposits	Includes small savings
M3 (Broad Money)	M1 + Time Deposits (TD) of banks + Certificates of Deposits	Most commonly used measure in India; RBI monitors this
M4	M3 + Total Post Office Deposits (excluding NSC)	Broadest measure; includes all post office deposits

Money multiplierm = 1 / CRR (or 1 / required reserve ratio) — shows how much money supply can increase from a deposit

Creation by bankingΔMoney Supply = Initial Deposit × Money Multiplier = D × (1/CRR)

Commercial Banks — Functions

Type	Functions
Primary	Accepting deposits (current, savings, recurring, fixed); lending loans & advances (cash credit, overdraft, term loans)
Secondary	Credit creation, agency services (collection of cheques, payment of bills, insurance), utility services (lockers, foreign exchange, investment advice)
Credit creation	Banks create credit by lending out a portion of deposits: if CRR = 10%, ₹100 deposit → ₹90 loan → deposited → ₹81 loan → ... → total deposits = ₹1000 (×10 multiplier)

Central Bank (RBI) — Functions & Tools

Function / Tool	Description
Banker to Government	Manages government accounts, receives payments, makes payments on behalf of government, manages public debt
Banker's Bank	Lender of last resort, clears cheques between banks, regulates commercial banks
Controller of Credit	Uses monetary policy tools to regulate money supply and credit in the economy
CRR (Cash Reserve Ratio)	Percentage of deposits banks must keep with RBI as cash; ↑ CRR → less lending → ↓ money supply (contractionary)
SLR (Statutory Liquidity Ratio)	Percentage of deposits banks must keep as liquid assets (cash, gold, govt securities); ↑ SLR → ↓ lending capacity
Repo Rate	Rate at which RBI lends short-term money to commercial banks; ↑ Repo → borrowing costlier → ↓ money supply
Reverse Repo Rate	Rate at which RBI borrows from commercial banks; ↑ Reverse Repo → banks prefer to park with RBI → ↓ money supply
Bank Rate	Rate at which RBI lends long-term to banks (against govt securities); ↑ Bank Rate → contractionary
MSF (Marginal Standing Facility)	Rate at which banks borrow overnight from RBI against govt securities (1% above repo rate)
LAF (Liquidity Adjustment Facility)	RBI's tool for day-to-day management of liquidity — repo & reverse repo operations
Open Market Operations (OMO)	RBI buys/sells govt securities in open market; buying securities → injects money (expansionary); selling → absorbs money (contractionary)
Moral Suasion	RBI persuades banks to follow its policies through advice, appeals, and informal directives

Monetary Policy

Type	When Used	Tools	Impact
Expansionary (Cheap Money)	Recession, low AD, high unemployment	↓ CRR, ↓ SLR, ↓ Repo Rate, buy securities (OMO), ↑ money supply	Encourages borrowing & spending, AD ↑, output ↑
Contractionary (Dear Money)	Inflation, excess AD, overheating	↑ CRR, ↑ SLR, ↑ Repo Rate, sell securities (OMO), ↓ money supply	Discourages borrowing, AD ↓, prices stabilise

Government Budget

Component	Description	Examples
Revenue Receipts	Do not create any liability or reduce assets	Tax revenue (income tax, GST, customs, excise), Non-tax revenue (interest, dividends, fees, fines)
Revenue Expenditure	Do not create any asset or reduce liability	Salaries, pensions, subsidies, interest on debt, maintenance
Capital Receipts	Create liability or reduce assets	Borrowing (market loans, external aid), disinvestment, small savings
Capital Expenditure	Create assets or reduce liabilities	Infrastructure, education buildings, health facilities, defence equipment, loans to states
Direct Taxes	Tax burden cannot be shifted to others	Income tax, corporate tax, wealth tax — progressive (rich pay more)
Indirect Taxes	Tax burden can be shifted to consumers	GST, customs duty, excise duty — regressive impact

Budget Deficits

Deficit	Formula	Significance
Budget Deficit	Total Expenditure − Total Receipts	Overall fiscal shortfall of government
Fiscal Deficit	Total Expenditure − Total Receipts except borrowing	Most important indicator; shows borrowing requirement = G − (T + non-debt capital receipts)
Primary Deficit	Fiscal Deficit − Interest Payments	Shows current fiscal stance without burden of past debt; if zero, borrowing = interest payments
Revenue Deficit	Revenue Expenditure − Revenue Receipts	Shows government is borrowing to finance current consumption (not assets)

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Important: Fiscal deficit is the most watched indicator. Fiscal Deficit = Borrowings of the government. India's Fiscal Responsibility and Budget Management (FRBM) Act mandates keeping fiscal deficit below 3% of GDP. The Fiscal Deficit to GDP ratio indicates the health of government finances.

Balance of Payments (BoP)

Component	Sub-accounts	Key Items
Current Account	Trade in goods (exports & imports), Trade in services (invisible trade: software, tourism, transport), Income (investment income, wages), Transfers (remittances, gifts, grants)	Trade Balance = Exports − Imports of goods
Capital Account	Foreign Direct Investment (FDI), Foreign Portfolio Investment (FPI), External Commercial Borrowings (ECB), NRI deposits, loans, banking capital flows	Shows capital inflows and outflows
Balance of Trade	Visible trade only: Merchandise Exports − Merchandise Imports	Favourable if Exports > Imports; Deficit if Imports > Exports

BoP Disequilibrium & Corrective Measures

Deficit in BoPTotal payments > Total receipts (more imports/outflows than exports/inflows)

Surplus in BoPTotal receipts > Total payments (more exports/inflows than imports/outflows)

DevaluationReducing the value of domestic currency in terms of foreign currency — exports become cheaper, imports become costlier

DepreciationMarket-driven fall in exchange rate (as opposed to devaluation which is govt-decided)

Trade policy measuresExport promotion (subsidies, incentives), import substitution, import quotas, tariffs

Exchange controlGovernment restricts foreign exchange transactions; all forex earned must be surrendered to RBI

Foreign exchange reservesRBI uses forex reserves to intervene in the market and stabilise exchange rate

Foreign Exchange Rate

DefinitionRate at which one currency is exchanged for another (e.g., ₹83 per $1 USD)

Fixed exchange rateGovernment/RBI fixes the rate; maintained through buying/selling forex reserves

Flexible (floating) exchange rateDetermined by market forces of demand & supply of forex

Managed floatingRBI intervenes occasionally to stabilise extreme fluctuations (India follows this)

DeterminationDemand for forex = imports + unilateral transfers; Supply of forex = exports + remittances + FDI

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Indian Economy

CLASS 10, 11, 12

Indian Economy on the Eve of Independence (1947)

Sector	Condition at Independence	Key Issues
Agriculture	Stagnant, subsistence farming; zamindari system exploited peasants; low productivity; colonial policies forced commercial crops; frequent famines (Bengal famine 1943 killed 3 million)	Land reforms needed, irrigation poor, no modern inputs
Industry	Deindustrialised by British; only cotton & jute mills existed; no capital goods industry; artisans destroyed; India became exporter of raw materials & importer of manufactured goods	Need for industrialisation, infrastructure development
Foreign Trade	Export of raw materials (cotton, jute, indigo, tea), import of manufactured goods; surplus trade balance but benefited Britain; restricted shipping (only British ships); drain of wealth	Need to reverse trade pattern, build own shipping
Infrastructure	Railways built mainly for British interests (transport raw materials to ports); ports developed for exports; communication for administrative control	Uneven development — railway & port areas developed, rest remained backward

Five Year Plans & Planning

Plan	Period	Model / Focus	Key Highlights
1st Plan	1951–56	Harrod-Domar Model	Focus on agriculture (community development, irrigation); Industrial Policy 1956; started with low base
2nd Plan	1956–61	Mahalanobis Model	Heavy industry & capital goods focus (steel, heavy machinery, mining); public sector led; Bhilai, Durgapur, Rourkela steel plants
3rd Plan	1961–66	Self-reliant economy	Balanced growth; 1962 war with China & 1965 war with Pakistan disrupted; drought years; failed to meet targets
Annual Plans	1966–69	Plan Holiday	Drought, devaluation of rupee (1966), inflation — could not commit to 5-year plan
4th Plan	1969–74	Growth with stability	Garibi Hatao slogan; bank nationalisation (1969, 14 banks); Green Revolution gains; Bokaro steel plant; Bangladesh war (1971)
5th Plan	1974–79	Removal of poverty	TPP (Twenty Point Programme); focus on employment; rolled over after Janata Party came to power (1977)
6th Plan	1980–85	Modernisation	Focus on modernisation of industry; anti-poverty programmes (IRDP, NREP); Indian economy began opening up slowly
7th Plan	1985–90	Liberalisation beginnings	Rajiv Gandhi's IT & telecom push; Bokaro, Vizag steel; food self-sufficiency achieved
8th Plan	1992–97	LPG Reforms	LPG reforms (1991): Liberalisation, Privatisation, Globalisation; Industrial Policy 1991; FEMA replaced FERA; Narasimha Rao-Manmohan Singh
9th Plan	1997–2002	Growth with social justice	Focus on agriculture, social sector, poverty reduction; Pokhran-II (1998); Kargil war (1999)
10th Plan	2002–07	Targeted growth	8% GDP growth target; Sarva Shiksha Abhiyan; RTI Act 2005; NRHM; universal elementary education
11th Plan	2007–12	Inclusive growth	Focus on education, health, infrastructure; NREGA expanded; MNREGA; Right to Education Act 2009
12th Plan	2012–17	Faster, sustainable, inclusive growth	Target 8% growth; skill development; Aadhaar expansion; GST preparation; infrastructure push

Planning Commission & NITI Aayog

Body	Established	Key Features
Planning Commission	1950 (PM Nehru)	Formulated Five Year Plans; resource allocation; advisory body; replaced by NITI Aayog
NITI Aayog	2015 (PM Modi)	National Institution for Transforming India — think tank; advisory role (no fund allocation); cooperative federalism; competitive benchmarking of states; replaces centralised planning with bottom-up approach; chaired by PM

Agriculture — Green Revolution & Food Security

Green RevolutionIntroduction of HYV (High Yielding Variety) seeds, chemical fertilisers, pesticides, modern irrigation (1960s-70s); pioneered by M.S. Swaminathan; started in Punjab, Haryana, Western UP

ImpactWheat production rose dramatically; India became self-sufficient in food grains by 1980s; food security improved

LimitationsRegional imbalance (NW India benefitted most), soil degradation, water table depletion, increased inequality (rich farmers benefitted more), environmental damage

MSP (Minimum Support Price)Government announces MSP for 23 crops; CACP (Commission for Agricultural Costs & Prices) recommends; ensures farmers get fair price; implemented through FCI procurement

PDS (Public Distribution System)Government distributes subsidised food grains (rice, wheat) through fair price shops; TPDS (Targeted PDS) has AAY (poorest) and PHH (priority households)

NFSA 2013National Food Security Act — 67% of population (75% rural, 50% urban) entitled to subsidised food: 5 kg wheat/rice per person/month at ₹2-3/kg; maternity benefit of ₹6,000

APMC ActAgricultural Produce Market Committee — regulates agricultural markets; mandis (wholesale markets); farmers sell through licensed agents; criticism: fees, cartelisation

e-NAMNational Agriculture Market — online trading portal linking mandis; transparent price discovery; farmers can sell to any registered buyer across India

Industrial Development

Policy / Event	Year	Key Features
Industrial Policy Resolution 1948	1948	Mixed economy model; six industries under state monopoly (arms, atomic energy, iron & steel, heavy machinery, coal mining, mineral oil); others open to private sector with licensing
Industrial Policy Resolution 1956	1956	Pushed for socialism: Schedule A (17 industries — exclusively public), Schedule B (12 industries — state + private), Schedule C (rest — private); licensing required; "Commanding heights" of economy to public sector
Industrial Licensing (abolition)	1991	Abolished for all except 18 strategic/sensitive industries; delicensing to promote competition and private investment
Liberalisation (LPG reforms)	1991	Industrial licensing abolished; MRTP Act relaxed; FDI allowed; automatic approval up to 51% in many sectors; rupee devalued; FEMA replaced FERA; tariff reduced
SEZ (Special Economic Zone)	2000 (SEZ Act 2005)	Dedicated zones with tax holidays, duty-free imports, relaxed labour laws; China model; to promote exports and manufacturing
Make in India	2014	Initiative to boost manufacturing (25% of GDP target); 25 sectors identified; ease of doing business reforms; FDI liberalisation; rank improved on World Bank index
PLI Scheme	2020	Production-Linked Incentive — incentivises domestic manufacturing in key sectors (electronics, pharma, auto, telecom); ₹1.97 lakh crore outlay

Poverty in India

Poverty lineMinimum level of consumption needed for basic necessities; based on calorie intake (rural: 2400 cal/day; urban: 2100 cal/day)

Tendulkar Committee (2009)Rs. 816/month for rural, Rs. 1000/month for urban (2004-05 prices); adopted composite expenditure basket (food + non-food); 37.2% below poverty line

Rangarajan Committee (2014)Rs. 32/day for rural, Rs. 47/day for urban; 29.5% below poverty line; broader basket including health & education

Multidimensional Poverty Index (MPI)NITI Aayog (2021): 25% Indians are multidimensionally poor; 3 dimensions (health, education, standard of living), 12 indicators

NREGA (2005)National Rural Employment Guarantee Act — guarantees 100 days of wage employment per rural household per year; aims at livelihood security; world's largest public works programme

ICDSIntegrated Child Development Services — provides nutrition, health, pre-school education to children (0-6 years) and mothers; supplementary nutrition, immunisation, health check-ups

PM GKYPradhan Mantri Garib Kalyan Yojana — free food grains (5 kg/person/month) to 80 crore beneficiaries during COVID-19

Unemployment — Types

Type	Definition	Example
Structural unemployment	Mismatch between skills workers have and skills employers need; long-term	Handloom weavers losing jobs to power looms; technology replacing manual labour
Frictional unemployment	Workers between jobs; temporary and short-term; occurs even in full employment	Fresh graduates searching for first job; switching between jobs
Seasonal unemployment	Occurs in specific seasons when work is not available	Agricultural labourers idle between sowing and harvesting; tourism workers in off-season
Disguised unemployment	More workers employed than actually needed; marginal product of extra workers is zero	Family farm where 4 people work but only 2 are needed; each person appears employed but contributes nothing extra
Cyclical unemployment	Due to recession/downturn in business cycle; AD falls, output falls, workers lose jobs	Job losses during 2008 financial crisis; COVID-19 pandemic job losses
Open unemployment	Workers willing to work at current wage but have no job; fully unemployed	Unemployed graduates registered with employment exchanges
Educated unemployment	Unemployment among educated youth; mismatch between education system and job market's needs	Engineering graduates not finding suitable jobs; India's major challenge

Infrastructure

Type	Components	Status / Initiatives
Energy / Power	Thermal, Hydro, Nuclear, Solar, Wind; India is 3rd largest electricity producer; still has transmission losses (~20%)	UDAY scheme (discom revival); Smart Grid; Ujjwala Yojana (LPG connections); renewable energy target 500 GW by 2030
Transport — Roads	Bharatmala Pariyojana (67,000 km); National Highways (~1,40,000 km); Golden Quadrilateral; Setu Bharatam	NH-44 longest; Pradhan Mantri Gram Sadak Yojana (PMGSY) for rural roads
Transport — Railways	4th largest network; Dedicated Freight Corridors (Western: Delhi-Mumbai; Eastern: Delhi-Kolkata); Kavach (anti-collision); Bullet train (Mumbai-Ahmedabad)	Vande Bharat Express; station redevelopment; 100% electrification target
Transport — Airways	RCS (Regional Connectivity Scheme) / UDAN; new airports in Tier-2/3 cities	Indigo, SpiceJet, Air India; Delhi airport busiest
Communication	Telecom (largest network with 1.2 billion subscribers); internet (700M+ users); BharatNet (broadband to villages)	5G rollout (2022); Digital India; UPI transactions
Social Infrastructure	Education (schools, universities, IITs, IIMs, AIIMS), Health (PHCs, CHCs, district hospitals)	Ayushman Bharat (health insurance); NEP 2020; skill development

Environment & Sustainable Development

Sustainable developmentDevelopment meeting present needs without compromising future generations' ability to meet theirs (Brundtland Report, 1987)

Brundtland CommissionOur Common Future (1987) — coined "sustainable development"; balance between economic growth and environmental protection

Rio Earth Summit (1992)Agenda 21 — global action plan for sustainable development; UNFCCC (climate change); CBD (biodiversity)

Millennium Dev Goals8 goals set by UN (2000) — halve extreme poverty, primary education, gender equality, child health, maternal health, combat HIV/AIDS, environmental sustainability, global partnership

Sustainable Dev Goals (SDGs)17 goals (2015-2030) — no poverty, zero hunger, good health, quality education, gender equality, clean water, clean energy, decent work, industry, reduced inequality, sustainable cities, responsible consumption, climate action, life below water, life on land, peace & justice, partnerships

India's environmental lawsEnvironment Protection Act 1986; Wildlife Protection Act 1972; Forest Conservation Act 1980; Air Act 1981; Water Act 1974

PollutionAir pollution (Delhi NCR worst), water pollution (Ganga Action Plan, Namami Gange), soil pollution, plastic waste

Climate changeIndia committed to net-zero by 2070 (COP26); Paris Agreement (2015) — limit warming to 1.5°C; NDCs (Nationally Determined Contributions)

Globalisation & LPG Reforms (1991)

LiberalisationRemoving licensing restrictions; reducing import duties; opening to foreign investment; rupee made partially convertible; financial sector reforms

PrivatisationDisinvestment in PSUs; selling government stakes to private sector; opening sectors to private players; Navratna & Miniratna status for profitable PSUs

GlobalisationIntegration of Indian economy with world economy; free trade; WTO membership (1995); capital account convertibility; technology transfer; MNCs entering India

WTO (1995)World Trade Organisation — replaced GATT; rules-based multilateral trading system; principles: MFN (Most Favoured Nation), National Treatment, non-discrimination; dispute settlement mechanism

MNCsMultinational Corporations — operate in multiple countries; bring FDI, technology, employment; examples: Apple, Google, Samsung, Toyota, Ford; also criticised for profit repatriation and market dominance

Positive impactHigher GDP growth, consumer choice increased, technology inflow, employment in IT/services, India became IT hub, FDI increased, poverty declined

Negative impactSmall-scale industries affected, agricultural distress, inequality increased, jobless growth, deindustrialisation in some areas, cultural homogenisation

FDI in IndiaAutomatic route (up to 100% in many sectors) and government route; sectors: telecom, insurance, defence, retail, aviation; FDI inflows: $81.7 billion (2020-21)

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Remember:LPG reforms of 1991 were triggered by the BOP crisis — India had only $1 billion in forex reserves (enough for 2 weeks of imports). The IMF granted a $7 billion loan with conditions: devalue rupee, open economy, reduce fiscal deficit. Finance Minister: Manmohan Singh; PM: P.V. Narasimha Rao. This was a turning point in India's economic history.

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Money & Banking

CLASS 10, 12

Evolution of Money

Stage	Form of Money	Key Features
Barter system	Exchange of goods for goods	Double coincidence of wants problem; no common measure of value; difficulty in storing wealth
Commodity money	Cattle, grains, shells, salt	Intrinsic value; divisible issues; perishability
Metallic money	Gold coins, silver coins, copper	Standardised value; durable; scarce; coined by rulers (Lydia, 600 BCE)
Paper money	Currency notes issued by government/RBI	Representative (backed by gold — now fiat); convenient; portable; backed by state authority
Bank money	Cheques, drafts, credit/debit cards	Convenient for large transactions; safe; reduces cash handling
Plastic money	Credit cards, debit cards, ATM cards	Electronic payment; global acceptance; linked to bank accounts
Digital money	UPI, NEFT, RTGS, mobile wallets, CBDC	Instant transfer; no physical contact; UPI revolution in India (₹149 lakh crore/month, 2023)

RBI — Reserve Bank of India

EstablishedApril 1, 1935 under RBI Act 1934; nationalised on January 1, 1949; headquartered in Mumbai

GovernorAppointed by Government of India; term of 3 years; current system: monetary policy committee (MPC) decides repo rate

Preamble"...to regulate the issue of Bank notes and keeping of reserves with a view to securing monetary stability in India and generally to operate the currency and credit system of the country to its advantage"

Monetary Policy Committee (MPC)6 members (3 RBI + 3 govt); decides repo rate; objective: 4% CPI inflation (±2% band); meets 6 times a year

Inflation TargetingRBI targets 4% CPI inflation with upper tolerance of 6% and lower of 2%; if breached, RBI Governor must write to Finance Minister explaining reasons and remedial actions

Quantitative ToolsCRR, SLR, Repo Rate, Reverse Repo, Bank Rate, MSF, OMO (open market operations)

Qualitative ToolsMoral suasion, credit rationing, margin requirements, consumer credit regulation, direct action

Commercial Banks — Credit Creation

Deposit creationBanks keep a fraction of deposits as reserves (CRR) and lend the rest; the lent money gets redeposited in the banking system, creating a multiplier effect

ExampleInitial deposit ₹1,000; CRR = 10%; Bank A keeps ₹100, lends ₹900 → deposited in Bank B → keeps ₹90, lends ₹810 → ... Total money created = 1000 × (1/0.1) = ₹10,000

Money multiplier1 / CRR = 1 / Reserve Ratio; higher CRR → lower money multiplier → less credit creation

Limiting factorsLeakages (currency held by public, excess reserves), CRR changes, SLR requirements, public preference for cash

Financial Inclusion

Initiative	Year	Key Features
PMJDY (Jan Dhan Yojana)	2014	Universal access to banking — zero balance account, RuPay debit card, overdraft up to ₹10,000, insurance; 50+ crore accounts opened; world's largest financial inclusion programme
MUDRA (Micro Units Dev & Refinance Agency)	2015	Loans up to ₹10 lakh to micro enterprises (Shishu up to ₹50K, Kishore ₹50K-₹5L, Tarun ₹5L-₹10L); for small businessmen, vendors, artisans
SHGs (Self Help Groups)	1990s	Groups of 10-20 rural poor (mostly women) who save regularly and lend among themselves; linked to banks for larger loans; empower women; NABARD promotes SHG-Bank linkage
UPI (Unified Payments Interface)	2016	Instant real-time payment between bank accounts via mobile; 24/7; no charges; biggest digital payment system globally; developed by NPCI
Digital India	2015	Programme to transform India into digital-empowered society; includes Aadhaar, DigiLocker, MyGov, e-Hospital, e-Sign

Important Committees in Indian Economic History

Committee	Year	Key Recommendations
National Income Committee	1949	Led by P.C. Mahalanobis; first systematic estimation of India's national income; base year 1948-49
Fiscal Commission	1949	Recommended finance commission structure for centre-state financial relations
Planning Commission	1950	Chaired by PM Nehru; Five Year Plans for planned economic development; replaced by NITI Aayog in 2015
Agricultural Prices Commission (CACP)	1965	Recommends MSP for crops; ensures fair price for farmers; considers cost of production and market factors
Narasimham Committee I	1991	Banking reforms — capital adequacy norms (Basel I), entry of private banks, reduction in SLR/CRR, NPA classification
Narasimham Committee II	1998	Further banking reforms — stronger banking board, merger of weak banks, autonomy for PSBs, asset liability management
Kelkar Task Force	2002	Direct & indirect tax reforms — recommended DTC (Direct Taxes Code), GST; simplified tax structure; broadened tax base
14th Finance Commission	2014	Increased states' share of central taxes from 32% to 42%; enhanced fiscal autonomy of states
N.K. Singh Committee (FRBM Review)	2017	Recommended fiscal deficit target of 3% by FY21; debt-to-GDP ratio 60%; created fiscal council (not implemented)
Urjit Patel Committee (Inflation)	2014	Recommended inflation targeting framework: 4% CPI ± 2%; MPC with 6 members; adopted by RBI

Inflation — Types, Effects & Control

Type	Description	Example
Demand-pull inflation	Excess demand over supply (AD > AS); "too much money chasing too few goods"; occurs at/near full employment	Post-COVID demand surge with supply bottlenecks
Cost-push inflation	Increase in cost of production (wages, raw materials, taxes) pushes prices up; supply-side factor; "sellers' inflation"	Oil price shock (1973, 2022); rising wages without productivity increase
Creeping inflation	Mild, gradual price rise (1-3% per year); considered healthy for economy as it encourages investment	Normal growth period in developed economies
Galloping inflation	Rapid price rise (10-100%+ per year); erodes purchasing power; uncertainty in economy	Turkey, Argentina (2020s)
Hyperinflation	Extremely high (1000%+ per year); money loses almost all value; people lose faith in currency	Germany (1923), Zimbabwe (2008), Venezuela (recent)
Stagflation	High inflation + stagnation (low growth) + high unemployment — worst combination; supply shocks cause it	1970s oil crisis; India post-1991 initially
Deflation	Persistent fall in general price level; reduces demand (people delay purchases expecting further fall); harmful	Japan's "Lost Decades" (1990s-2000s); Great Depression (1930s)
Reflation	Deliberate government policy to reverse deflation — increase AD through spending & monetary easing	Post-2008 stimulus packages

Measuring Inflation & Control Measures

Measure	Description	Components
CPI (Consumer Price Index)	Measures changes in retail prices of goods consumed by households; RBI uses CPI for inflation targeting	CPI for Industrial Workers (CPI-IW), CPI for Agricultural Labourers (CPI-AL), CPI (Combined) — base year 2012
WPI (Wholesale Price Index)	Measures changes in wholesale prices; tracks prices at factory/gate level; base year 2011-12	Manufactured products (64%), Primary articles (22%), Fuel & Power (14%)
GDP Deflator	Ratio of nominal to real GDP × 100; broadest measure — covers all goods & services in GDP	Not based on a fixed basket; automatically reflects changes in consumption pattern

Monetary measures↑ Repo Rate, ↑ CRR, ↑ SLR, sell govt securities (OMO) — reduce money supply to control inflation

Fiscal measuresReduce govt spending, increase taxes, reduce subsidies — reduce AD to control demand-pull inflation

Supply-side measuresImprove agricultural production, ease supply chains, reduce import duties, anti-hoarding measures

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Exam tip: Remember the difference between CPI and WPI — CPI includes services (health, education, housing) while WPI does not; WPI includes commodities at wholesale level. RBI uses CPI (Combined) as its anchor for inflation targeting (4% ± 2%).

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Development

CLASS 10

Development Goals

Different goals for different peopleDevelopment means different things to different people — a landless labourer wants land, an urban worker wants job security, a student wants quality education, a business person wants profits and growth

Income as a criterionPer capita income is commonly used but not the only criterion; countries are classified by World Bank as Low Income (<$1,165 GNI/capita), Lower Middle, Upper Middle, High Income

Beyond incomeHealth indicators (life expectancy, IMR, MMR), education (literacy, enrollment), standard of living (housing, sanitation), freedom, security also matter

Conflicting goalsIndustrialist wants a dam for electricity; displaced people want land and rehabilitation — development goals may conflict

National Development

Per Capita IncomeTotal national income divided by total population; World Bank uses GNI per capita (Atlas method, USD) to classify countries

HDI (Human Development Index)UNDP measure combining 3 dimensions: (1) Long & healthy life — Life expectancy at birth, (2) Education — Mean years of schooling + Expected years, (3) Standard of living — GNI per capita (PPP); range 0-1; Norway highest (~0.96); India ~0.644 (131st rank)

Sustainable DevelopmentDevelopment without environmental degradation; meets present needs without compromising future; inter-generational equity; resource conservation

Public FacilitiesHealth, education, sanitation, safe drinking water, public transport — essential for quality of life; provided by government; cannot be left to private market alone

GDP vs GNP vs PCI

Measure	Definition	Focus
GDP (Gross Domestic Product)	Total value of goods & services produced within the country's borders	What is produced within the country (by anyone)
GNP (Gross National Product)	GDP + Income earned by citizens abroad − Income earned by foreigners in the country	What is produced by the country's citizens (anywhere)
PCI (Per Capita Income)	National Income / Total Population; average income per person	Average standard of living (does not show distribution)
NNP (Net National Product)	GNP − Depreciation; also called National Income at factor cost	True measure of national income after wear & tear

PCI Comparisons & Limitations

World Bank classification (2023)Low income: <$1,165 GNI/capita; Lower-middle: $1,165-$4,515; Upper-middle: $4,516-$14,005; High: >$14,005; India: Lower-middle income

Limitations of PCIDoes not show income distribution (inequality); does not reflect quality of life; does not account for non-market activities (household work); does not show environmental degradation; can be misleading for comparison due to price differences

PPP (Purchasing Power Parity)Adjusts for differences in price levels between countries; $1 buys more in India than in USA; PPP-adjusted income gives better comparison of real living standards; India: GDP PPP = $14.6 trillion (3rd largest)

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Key concept: Kerala has lower per capita income than Punjab but has better human development indicators (literacy ~94%, IMR 6/1000, life expectancy 77 years) — showing that income alone is not adequate to measure development. HDI is a more comprehensive measure.

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Statistics for Economics

CLASS 11

Collection of Data

Method	Description	Advantages	Disadvantages
Primary data	Collected first-hand by the researcher — surveys, interviews, experiments, observation	Specific to research need; accurate; reliable; up-to-date	Expensive; time-consuming; requires skill
Secondary data	Already collected by others — government publications, journals, reports, websites	Cheap; readily available; saves time; covers long periods	May be outdated; may not match exact need; less reliable
Census method	Every unit of the population is surveyed	Complete information; highly accurate; detailed	Very expensive; time-consuming; not feasible for large populations
Sampling method	A representative subset (sample) of the population is surveyed	Cheaper; faster; practical for large populations	Sampling error; may not be fully representative

Sampling Methods

Method	Description	When Used
Simple Random Sampling	Every unit has equal chance of being selected; lottery method or random number tables	Homogeneous population; small population
Stratified Random Sampling	Population divided into strata (groups) based on characteristics; random sample from each stratum	Heterogeneous population; proportionate representation needed
Systematic Sampling	Select every kth unit from a list (sampling interval k = N/n)	Large populations with ordered lists
Cluster Sampling	Population divided into clusters (natural groups); entire clusters randomly selected	Wide geographical spread; cost-effective
Judgemental (Purposive)	Researcher selects sample based on expertise and judgement	Specialised studies; expert knowledge available
Convenience Sampling	Most accessible units selected	Exploratory studies; quick results needed

Organisation of Data

Raw dataUnorganised data collected from the field; needs to be classified and tabulated

ClassificationData grouped into classes based on common characteristics; types: chronological, geographical, qualitative, quantitative

Frequency distributionTable showing classes and their frequencies (number of observations in each class)

Class intervalRange of values in a class: lower limit to upper limit; e.g., 10–20, 20–30

Class widthDifference between upper and lower limit of a class; e.g., 20 − 10 = 10

Mid-point(Lower limit + Upper limit) / 2; e.g., (10+20)/2 = 15

Cumulative frequency (cf)Running total of frequencies; more than type (from top) or less than type (from bottom); used to draw ogive

Exclusive vs InclusiveExclusive: upper limit excluded from class (10-20, 20-30); Inclusive: both limits included (10-19, 20-29); convert inclusive to exclusive by adjusting limits

Presentation of Data — Diagrams

Diagram	Description	When Used
Bar diagram	Rectangular bars of equal width; height proportional to value; can be simple, multiple, or component (stacked)	Comparing quantities across categories; discrete data
Pie chart (Pie diagram)	Circle divided into sectors; angle of each sector = (value/total) × 360°; shows composition	Showing parts of a whole; percentage composition
Histogram	Rectangles on a continuous base (class intervals); area proportional to frequency; no gaps between bars	Continuous frequency distribution; grouped data
Frequency polygon	Line graph joining mid-points of class intervals (from histogram); starts and ends on x-axis	Compare two or more frequency distributions; overlay graphs
Ogive (Cumulative frequency curve)	Smooth curve through cumulative frequency points plotted against upper limits; two types: less than & more than	Finding median graphically; percentile calculation; interpolation

Measures of Central Tendency — Mean

Type	Formula	Notes
Arithmetic Mean (Direct)	X̄ = Σxᵢ / n	Sum of all observations divided by number of observations
Arithmetic Mean (Discrete)	X̄ = Σfx / Σf	Each value multiplied by its frequency
Arithmetic Mean (Grouped)	X̄ = Σfm / Σf (where m = midpoint)	Use class midpoints as x values
Step Deviation (Shortcut)	X̄ = A + (Σfd' / Σf) × h	A = assumed mean, d' = (x−A)/h, h = class width; fastest method for grouped data
Weighted Mean	X̄w = Σwx / Σw	When observations have different importance (weights)
Combined Mean	X̄₁₂ = (n₁X̄₁ + n₂X̄₂) / (n₁ + n₂)	Mean of two combined groups

Measures of Central Tendency — Median & Mode

Measure	Ungrouped Data	Grouped Data
Median	Arrange data in ascending order; Median = value at position (n+1)/2 for odd n; average of n/2 and (n/2+1) for even n	Median = L + [(N/2 − cf) / f] × h; where L = lower limit of median class, cf = cumulative frequency before median class, f = frequency of median class
Mode	Most frequently occurring value	Mode = L + [(f₁ − f₀) / (2f₁ − f₀ − f₂)] × h; where f₁ = frequency of modal class, f₀ = before modal, f₂ = after modal
Quartiles	Q₁ = value at (n+1)/4 position; Q₃ = value at 3(n+1)/4 position	Q₁ = L₁ + [(N/4 − cf₁)/f₁] × h; Q₃ = L₃ + [(3N/4 − cf₃)/f₃] × h
Percentile	Value at position p(n+1)/100	Pₖ = L + [(kN/100 − cf)/f] × h

Empirical relationshipMode ≈ 3 × Median − 2 × Mean (for moderately skewed distributions)

Position of mean, median, modeRight-skewed (positive): Mean > Median > Mode; Left-skewed (negative): Mean < Median < Mode; Symmetric: Mean = Median = Mode

Measures of Dispersion

Measure	Formula / Description	Features
Range	R = Maximum value − Minimum value	Simplest measure; ignores all other values; affected by extreme values
Quartile Deviation (QD)	QD = (Q₃ − Q₁) / 2	Based on middle 50% data; ignores extreme values; not based on all observations
Mean Deviation (MD)	MD = Σf\|xᵢ − X̄\| / Σf (about mean); or Σf\|xᵢ − M\| / Σf (about median)	Uses absolute deviations; median-based MD is preferred; not suitable for further mathematical treatment
Standard Deviation (σ)	σ = √[Σf(xᵢ − X̄)² / Σf] (population); s = √[Σf(xᵢ − X̄)² / (n−1)] (sample)	Best measure; uses squared deviations; based on all values; suitable for further analysis; unit same as data
Variance (σ²)	σ² = Σf(xᵢ − X̄)² / Σf	Square of standard deviation; unit is square of data unit
Coefficient of Variation (CV)	CV = (σ / X̄) × 100	Unitless; used for comparing dispersion of two datasets with different units or means; lower CV = more consistent

Standard Deviation — Shortcut Methods

Method	Formula	When to Use
Direct method	σ = √(Σfx²/Σf − (Σfx/Σf)²)	Small dataset, simple values
Shortcut (Assumed mean)	σ = √(Σfd²/Σf − (Σfd/Σf)²) where d = x − A	Medium-sized dataset; A = assumed mean near centre
Step deviation	σ = √[Σfd'²/Σf − (Σfd'/Σf)²] × h where d' = (x−A)/h	Large dataset with class intervals; h = class width; fastest method

Correlation

Type	Value / Description	Example
Positive correlation	Both variables move in the same direction: r = +1 (perfect) to 0	Income & consumption; height & weight; temperature & ice cream sales
Negative correlation	Variables move in opposite directions: r = −1 (perfect) to 0	Price & quantity demanded; temperature & winter clothing sales
No correlation	r = 0; no linear relationship between variables	Height & exam scores; shoe size & intelligence
Simple correlation	Between two variables only	Income & savings
Multiple correlation	Among three or more variables simultaneously	Income, education & health
Partial correlation	Two variables controlling for a third	Income & savings controlling for family size

Correlation — Methods

Method	Formula	Notes
Karl Pearson's Coefficient (r)	r = Σdxdy / √(Σdx² × Σdy²) where dx = x − x̄, dy = y − ȳ	For quantitative data; linear relationship; range: −1 to +1; r² = coefficient of determination (proportion of variation explained)
Spearman's Rank Correlation (ρ)	ρ = 1 − (6Σd² / n(n²−1)) where d = rank difference	For qualitative data or when data not normally distributed; uses ranks; range: −1 to +1; for tied ranks use adjusted formula
Scatter diagram	Plot (x,y) pairs on graph; pattern shows direction and strength of correlation	Visual method; gives rough idea; no numerical value

Properties of rr is independent of change of origin & scale; r lies between −1 and +1; r is a pure number (unitless); if r = 0, variables are uncorrelated (but may have non-linear relation)

Interpretationr = 0.7-1.0: high positive; 0.3-0.7: moderate; 0-0.3: low; similar for negative

Index Numbers

Index	Formula	Description
Simple Aggregative	(ΣP₁ / ΣP₀) × 100	Sum of current year prices / sum of base year prices × 100; simple but affected by units
Simple Average of Price Relatives	Mean of (P₁/P₀ × 100) for each commodity	Average of individual price indices; removes unit problem
Laspeyres Index (CPI)	(ΣP₁Q₀ / ΣP₀Q₀) × 100	Uses base year quantities as weights; overstates inflation (base qty basket may not be current)
Paasche Index	(ΣP₁Q₁ / ΣP₀Q₁) × 100	Uses current year quantities as weights; understates inflation
Fisher's Ideal Index	√(Laspeyres × Paasche)	Geometric mean of Laspeyres & Paasche; satisfies time reversal & factor reversal tests; considered ideal
CPI (Consumer Price Index)	Tracks retail prices of a fixed basket of goods consumed by a typical household	Used for inflation targeting; base year 2012; measures cost of living
WPI (Wholesale Price Index)	Tracks prices at wholesale level for goods	Tracks prices of commodities traded in bulk; base year 2011-12
Inflation Rate	((CPI₂ − CPI₁) / CPI₁) × 100	Percentage change in price index over a period

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Exam tip: For index numbers, remember: Laspeyres uses base year quantities (Q₀), Paasche uses current year quantities (Q₁), and Fisher'sis the geometric mean of both. Fisher's is called "ideal" because it satisfies both the Time Reversal Test and Factor Reversal Test.

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Key Concepts & Definitions

GLOSSARY

Core Economic Terms (A–D)

Term	Definition
Absolute Poverty	State where income falls below the minimum required to meet basic necessities (food, shelter, clothing)
Adverse Selection	Problem where buyers/sellers have asymmetric information before transaction — e.g., sick people more likely to buy health insurance
Aggregate Demand (AD)	Total demand for all goods and services in the economy: AD = C + I + G + (X − M)
Aggregate Supply (AS)	Total supply of all goods and services in the economy: AS = C + S
Arbitrage	Buying in a cheaper market and selling simultaneously in a dearer market to earn risk-free profit
Autarky	A state of economic self-sufficiency; no trade with other countries
Balance of Payments (BoP)	Systematic record of all economic transactions between residents of a country and the rest of the world
Barter System	Exchange of goods for goods without the use of money; requires double coincidence of wants
Black Money	Income that is not reported to tax authorities and on which no tax is paid; illegal/unaccounted money
Budget	Annual statement of government's estimated receipts and expenditures; two types: Revenue Budget and Capital Budget
Capital	Produced means of production — machinery, tools, buildings, infrastructure; one of the four factors of production
Capital Formation	Process of increasing the stock of real capital in an economy; investment leads to capital formation
Cartel	Group of firms that collude to restrict output and raise prices to maximise joint profits (e.g., OPEC)
Ceteris Paribus	"Other things remaining constant" — assumption used in economic analysis to isolate the effect of one variable
Command Economy	Economy where government/central authority makes all economic decisions — what, how, for whom
Consumer Surplus	Difference between what consumers are willing to pay and what they actually pay; area above price and below demand curve
Cost-Push Inflation	Inflation caused by increase in cost of production (raw materials, wages); supply-side factor
Cross Elasticity of Demand	Responsiveness of demand for one good to price change of another: Exy = (%ΔQx) / (%ΔPy)
Deadweight Loss	Loss of economic efficiency when equilibrium outcome is not achievable or not achieved; e.g., due to tax or monopoly
Deflation	Persistent fall in general price level; reduces demand and economic activity; opposite of inflation
Demand-Pull Inflation	Inflation caused when aggregate demand exceeds aggregate supply; "too much money chasing too few goods"
Depreciation (Currency)	Fall in value of domestic currency relative to foreign currency due to market forces of demand and supply
Devaluation	Deliberate reduction in the value of domestic currency by the government against foreign currencies
Dumping	Selling goods in a foreign market at a price lower than the domestic market price or below cost of production

Core Economic Terms (E–L)

Term	Definition
Economic Growth	Increase in real GDP/GNP over time; quantitative measure of expansion of economy
Economic Development	Broader than growth — includes improvements in HDI, poverty reduction, inequality reduction, quality of life
Economies of Scale	Reduction in average cost as output increases — due to specialisation, bulk buying, financial economies, risk bearing
Elasticity of Demand	Measure of responsiveness of quantity demanded to change in price, income, or price of related goods
Externality	Cost or benefit affecting a third party not involved in the transaction — e.g., pollution (negative), education (positive)
Factors of Production	Land (natural resources), Labour (human effort), Capital (produced means), Entrepreneurship (risk-taker, organiser)
Fiscal Policy	Government's use of taxation and spending to influence the economy — expansionary (tax cuts, more spending) or contractionary
Foreign Direct Investment (FDI)	Long-term investment by a foreign entity in productive assets of another country — e.g., setting up a factory
Foreign Institutional Investor (FII/FPI)	Investment by foreign entities in financial markets (stocks, bonds) — short-term, portfolio investment
Free Trade	International trade without any barriers (tariffs, quotas); trade based on comparative advantage
GDP Deflator	Ratio of nominal GDP to real GDP × 100; measures the level of prices of all new, domestically produced goods and services
Giffen Goods	Inferior goods where demand increases when price increases (because income effect outweighs substitution effect); rare — e.g., staple food for very poor
Gini Coefficient	Measure of income inequality — 0 (perfect equality) to 1 (perfect inequality); derived from Lorenz curve
Gross Fiscal Deficit	Government's total expenditure minus total receipts excluding borrowings; equal to total borrowings
Human Development Index (HDI)	Composite index measuring health (life expectancy), education (years of schooling), and standard of living (GNI per capita)
Hyperinflation	Extremely rapid price increase (1000%+ per year); money loses almost all value
Income Effect	Change in quantity demanded due to change in real income (purchasing power) caused by price change
Inferior Goods	Goods for which demand decreases when income increases (e.g., coarse grains, second-hand goods)
Inflation	Sustained increase in general price level; reduces purchasing power of money
Investment	Addition to capital stock — building new factories, machinery, infrastructure; I = change in capital stock
Invisible Trade	Trade in services — IT, banking, insurance, tourism, transportation — not visible physical goods
Lorenz Curve	Graph showing degree of income inequality; cumulative % of population vs cumulative % of income; diagonal = perfect equality

Core Economic Terms (M–Z)

Term	Definition
Macroeconomics	Study of economy as a whole — national income, employment, inflation, fiscal policy, monetary policy
Marginal Cost (MC)	Change in total cost from producing one additional unit of output: MC = ΔTC/ΔQ
Marginal Product (MP)	Additional output produced by one more unit of a variable input: MP = ΔTP/ΔL
Marginal Revenue (MR)	Additional revenue from selling one more unit: MR = ΔTR/ΔQ
Microeconomics	Study of individual economic units — consumers, firms, markets; price determination, demand, supply
Mixed Economy	Economy with both private and public sectors; combines market efficiency with government intervention
Monopoly	Market with single seller, no close substitutes, high barriers to entry; price maker
Moral Hazard	Post-transaction problem — after entering a contract, one party changes behaviour because the other bears the cost (e.g., reckless driving after buying insurance)
Normal Goods	Goods for which demand increases when income increases (e.g., fruits, clothing, electronics)
Oligopoly	Market with few large firms; interdependent decision-making; may lead to collusion; kinked demand curve
Opportunity Cost	Value of the next best alternative forgone when a choice is made
Per Capita Income	Average income per person: National Income / Total Population
Price Ceiling	Government-set maximum price below equilibrium; creates shortage (e.g., rent control)
Price Floor	Government-set minimum price above equilibrium; creates surplus (e.g., minimum support price for crops)
Producer Surplus	Difference between what producers receive and their minimum acceptable price; area below price and above supply curve
Progressive Tax	Tax rate increases as income increases — higher income earners pay a larger percentage; e.g., income tax slabs
Public Goods	Non-excludable and non-rivalrous goods — national defence, street lighting, public parks; provided by government
Purchasing Power Parity (PPP)	Adjustment for price level differences across countries; how much a basket of goods costs in each country
Recession	Contraction in economic activity — two consecutive quarters of negative GDP growth; rising unemployment, falling output
Substitution Effect	Change in quantity demanded due to change in relative prices (cheaper good becomes more attractive)
Supply Curve	Upward sloping curve showing positive relationship between price and quantity supplied (higher price → more supplied)
Subsidy	Government payment to producers/consumers to reduce price; shifts supply curve rightward; increases quantity and reduces price
Tariff	Tax on imported goods; makes imports more expensive; protects domestic producers; reduces imports
Transfer Payments	One-way payments from government without any good/service in return — pensions, scholarships, unemployment benefits
Veblen Goods	Luxury goods where demand increases as price increases due to conspicuous consumption (status symbol effect)
Velocity of Money	Number of times a unit of money changes hands in a given period; MV = PQ (equation of exchange)

Important Indian Economy Terms

Term	Definition
Aadhaar	12-digit unique identity number issued by UIDAI; world's largest biometric ID system; 1.3+ billion enrolled
ASEAN	Association of Southeast Asian Nations — regional intergovernmental organisation; India-ASEAN free trade agreement
BRICS	Brazil, Russia, India, China, South Africa — grouping of major emerging economies; New Development Bank (BRICS Bank)
CAG (Comptroller & Auditor General)	Constitutional body; audits government accounts; ensures public money is spent as authorised
CENVAT	Central Value Added Tax — tax credit mechanism on excise duty paid on inputs; replaced by GST
Demographic Dividend	When working-age population (15-64) is larger than dependents; potential for faster growth if skilled and employed
Disinvestment	Government selling its equity stake in public sector enterprises to private investors; to raise revenue and improve efficiency
FDI vs FPI	FDI: long-term, in productive assets (factories, land); FPI: short-term, in financial markets (stocks, bonds); both bring forex
FRBM Act	Fiscal Responsibility and Budget Management Act (2003) — mandates fiscal deficit below 3% of GDP; aims for fiscal discipline
GIFT City	Gujarat International Finance Tec-City — India's first international financial services centre; like Singapore/Dubai
GST (Goods & Services Tax)	Indirect tax replacing multiple taxes (VAT, excise, service tax); launched July 1, 2017; one nation one tax; dual structure (CGST + SGST + IGST)
Make in India	Initiative to boost manufacturing (25 sectors); attract FDI; improve ease of doing business; create 100 million jobs
NABARD	National Bank for Agriculture and Rural Development — refinances agricultural credit; supervises RRBs; promotes rural development
NDMC / MUDRA	Micro Units Development & Refinance Agency — provides loans to micro enterprises up to ₹10 lakh
NEFT / RTGS	NEFT: batch-based electronic fund transfer (settled in half-hourly batches); RTGS: real-time gross settlement for high-value transfers (≥₹2 lakh)
NPA (Non-Performing Asset)	Loan on which interest/principal is overdue for 90+ days; bad loan; stress for banks; SARFAESI Act for recovery
RuPay	Indian domestic card payment network (like Visa/Mastercard); developed by NPCI; accepted on UPI, ATMs, POS; PMJDY cards are RuPay
SEBI	Securities and Exchange Board of India — regulator of securities market (stock exchanges, mutual funds, IPOs); established 1992
TIPS (Tertiary Sector)	Tertiary sector = service sector — IT, banking, finance, health, education, tourism; largest contributor to India's GDP (~54%)

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Quick revision: For exams, focus on these high-weightage terms:

GDP, GNP, Fiscal Deficit, Inflation, MPC/MPS, Multiplier, Opportunity Cost, Elasticity, MRS, Price Ceiling/Floor, Subsidy vs Tax, Externalities, CRR, Repo Rate

. These appear repeatedly across all classes.

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Important Formulas

QUICK REFERENCE

Elasticity Formulas

Formula	Expression	Notes
Price Elasticity (Point method)	Ed = (ΔQ/ΔP) × (P/Q)	At a specific point on demand curve
Price Elasticity (Arc method)	Ed = (ΔQ/ΔP) × ((P₁+P₂)/(Q₁+Q₂))	Average of two points; for large changes
Price Elasticity (Expenditure)	If TE rises when P falls → Ed > 1	Total Expenditure (TE) = P × Q method
Income Elasticity	Ey = (%ΔQ) / (%ΔY)	Positive for normal, negative for inferior goods
Cross Elasticity	Exy = (%ΔQx) / (%ΔPy)	Positive for substitutes, negative for complements

National Income Formulas

Formula	Expression	Notes
GDPmp	C + I + G + (X − M)	Expenditure method; market prices
GNPmp	GDPmp + NFIA	NFIA = Net Factor Income from Abroad
NDPmp	GDPmp − Depreciation	Depreciation = consumption of fixed capital
NNPmp	GNPmp − Depreciation	Net National Product at market prices
NNPfc (National Income)	NNPmp − Net Indirect Taxes	Net Indirect Taxes = Indirect Taxes − Subsidies
Personal Income	NI − Undistributed Profits − Corporate Tax − Net Interest + Transfers	Income actually received by persons
Disposable Income	Personal Income − Direct Taxes	Income available for consumption and saving
GDP Deflator	(Nominal GDP / Real GDP) × 100	Measures overall price level
Real GDP	(Nominal GDP / GDP Deflator) × 100	Adjusting for inflation
GVA at MP	Value of Output − Intermediate Consumption	Gross Value Added
GVA at FC	GVA at MP − Net Indirect Taxes	Factor cost = market price − NIT

Income Determination Formulas

Formula	Expression	Notes
Consumption Function	C = a + bY	a = autonomous consumption, b = MPC
Saving Function	S = −a + (1−b)Y	−a = dissaving, (1−b) = MPS
MPC	MPC = ΔC / ΔY	Marginal Propensity to Consume; 0 < MPC < 1
MPS	MPS = ΔS / ΔY	Marginal Propensity to Save; MPC + MPS = 1
APC	APC = C / Y	Average Propensity to Consume
APS	APS = S / Y	Average Propensity to Save; APC + APS = 1
Equilibrium	AD = AS or S = I	Aggregate demand equals aggregate supply
Multiplier (k)	k = 1 / (1 − MPC) = 1 / MPS	ΔY = k × ΔI
Deflationary Gap	AD at full employment − Actual AD	AD < AS; unemployment; output below potential
Inflationary Gap	Actual AD − AD at full employment	AD > AS at full employment; prices rise

Money & Banking Formulas

Formula	Expression	Notes
Money Multiplier	m = 1 / CRR	Maximum potential money creation from deposits
Credit Creation	ΔMS = Initial Deposit × (1/CRR)	Total money supply change from a deposit
M1	Currency + Demand Deposits + Other Deposits with RBI	Narrow money supply
M3	M1 + Time Deposits	Broad money supply
CPI Inflation Rate	((CPI₂ − CPI₁) / CPI₁) × 100	Year-on-year inflation from CPI
WPI Inflation Rate	((WPI₂ − WPI₁) / WPI₁) × 100	Year-on-year inflation from WPI
Exchange Rate	Price of foreign currency in terms of domestic	₹83 per $1 USD means $1 costs ₹83
Fiscal Deficit	Total Expenditure − (Revenue Receipts + Non-debt Capital Receipts)	Government's total borrowing requirement
Primary Deficit	Fiscal Deficit − Interest Payments	Fiscal stance excluding past debt burden
Revenue Deficit	Revenue Expenditure − Revenue Receipts	Borrowing for consumption, not assets
Budget Deficit	Total Expenditure − Total Receipts (all)	Overall gap in government budget

Cost & Revenue Formulas

Formula	Expression	Notes
Total Cost	TC = TFC + TVC	Fixed + Variable costs
Average Fixed Cost	AFC = TFC / Q	Always falls; rectangular hyperbola
Average Variable Cost	AVC = TVC / Q	U-shaped; falls then rises
Average Total Cost	AC = TC / Q = AFC + AVC	U-shaped; minimum where MC = AC
Marginal Cost	MC = ΔTC / ΔQ = ΔTVC / ΔQ	U-shaped; minimum before AVC and AC minimums
Total Revenue	TR = P × Q	Price × Quantity sold
Average Revenue	AR = TR / Q = P	AR curve = Demand curve
Marginal Revenue	MR = ΔTR / ΔQ	Under monopoly: MR < AR; under perfect comp: MR = AR = P
Profit	π = TR − TC	Positive = supernormal profit; zero = normal; negative = loss
Shut-down condition	P < AVC (min)	Below this, firm should shut down in short run

Statistics Formulas

Formula	Expression	Notes
Arithmetic Mean (Direct)	X̄ = Σxᵢ / n	Simple average
Mean (Grouped)	X̄ = Σfm / Σf	m = class midpoint
Mean (Step Deviation)	X̄ = A + (Σfd'/Σf) × h	d' = (x−A)/h, h = class width
Median (Ungrouped)	M = value at position (n+1)/2	Arrange data ascending first
Median (Grouped)	M = L + [(N/2 − cf) / f] × h	L = lower limit of median class
Mode (Grouped)	Z = L + [(f₁−f₀)/(2f₁−f₀−f₂)] × h	Modal class = class with highest frequency
Empirical Relation	Mode ≈ 3Median − 2Mean	For moderately skewed distributions
Range	R = Max − Min	Simplest measure of dispersion
Quartile Deviation	QD = (Q₃ − Q₁) / 2	Semi-interquartile range
Mean Deviation	MD = Σf\|x−x̄\| / Σf	Absolute deviations from mean
Variance (σ²)	σ² = Σf(x−x̄)² / Σf	Average of squared deviations
Std Deviation (σ)	σ = √[Σf(x−x̄)² / Σf]	Square root of variance
Std Dev (Shortcut)	σ = √[Σfd'²/Σf − (Σfd'/Σf)²] × h	Step deviation method
Coefficient of Variation	CV = (σ / X̄) × 100	Unitless; for comparing dispersions
Karl Pearson r	r = Σdxdy / √(Σdx²·Σdy²)	Product moment correlation
Spearman ρ	ρ = 1 − 6Σd² / n(n²−1)	Rank correlation coefficient
Laspeyres Index	L = (ΣP₁Q₀ / ΣP₀Q₀) × 100	Base year quantity weights
Paasche Index	P = (ΣP₁Q₁ / ΣP₀Q₁) × 100	Current year quantity weights
Fisher's Index	F = √(L × P)	Geometric mean of L and P
Inflation Rate	((PI₂ − PI₁) / PI₁) × 100	From any price index

Production & Profit Formulas

Formula	Expression	Notes
Total Product	TP = f(L, K)	Production function output
Average Product	AP = TP / L	Output per unit of labour
Marginal Product	MP = ΔTP / ΔL	Additional output per extra unit
MRT (PPC)	MRT = ΔY / ΔX	Marginal Rate of Transformation
Budget Line	M = Px·X + Py·Y	Consumer's budget constraint
Budget Line slope	Slope = −Px / Py	Price ratio (absolute value)
MRS	MRSxy = MUx / MUy	Marginal Rate of Substitution
Consumer Equilibrium (Ordinal)	MRSxy = Px / Py	Tangency of IC and Budget Line
Consumer Equilibrium (Cardinal)	MUx/Px = MUy/Py = MUm	Law of Equi-Marginal Utility
Profit Maximisation	MR = MC (MC rising)	Equilibrium condition for firm
Producer Surplus	PS = Area above MC and below price	Gain to producers from selling at market price
Consumer Surplus	CS = Area above price and below demand	Gain to consumers from buying below willingness to pay

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Quick formula checklist: Before the exam, memorise these key formulas — k = 1/(1−MPC), C = a + bY, Ed = (ΔQ/ΔP)×(P/Q), Mode = 3Med − 2Mean, CV = (σ/X̄)×100, r = Σdxdy/√(Σdx²·Σdy²), Fisher = √(L×P). Write them at the start of the exam for quick reference.

Important Constants & Values for Numerical Problems

Item	Value / Description	Context
CRR (India, 2024)	~4.5% (varies with RBI policy)	Cash Reserve Ratio — % of deposits kept with RBI
SLR (India)	~18%	Statutory Liquidity Ratio — % of deposits as liquid assets
Repo Rate (India, 2024)	~6.50%	Rate at which RBI lends to commercial banks
Reverse Repo Rate	~6.25%	Rate at which RBI borrows from banks (usually 0.25% below repo)
India GDP Growth (FY24)	~8.2%	Real GDP growth rate; nominal ~13%
India's Rank in GDP (PPP)	3rd largest	After China and USA; ~$14.6 trillion PPP GDP
India's Rank in GDP (Nominal)	5th largest	After USA, China, Germany, Japan; ~$3.9 trillion
India's HDI Rank (2023)	131 out of 191	HDI value ~0.644 (Medium Human Development)
India's Population (2024)	~1.44 billion	Largest in the world (surpassed China in 2023)
India's FDI Inflow (2023-24)	~$81.7 billion	Services sector gets the most FDI
India's Inflation Target (RBI)	4% ± 2%	CPI-based inflation targeting (2-6% band)
India's Fiscal Deficit Target	4.5% of GDP by FY26	Under FRBM Act; was 5.1% in FY24

Important Dates in Indian Economic History

Year	Event	Significance
1947	Independence	Partition; economy devastated; colonial exploitation ended; need for rebuilding
1950	Planning Commission established	Five Year Plans era began; Nehru-Mahalanobis model for industrialisation
1956	Industrial Policy Resolution	Socialist pattern; public sector dominance in 17 industries; licensing introduced
1966	Devaluation of Rupee	Rupee devalued by 36.5% (₹4.76 → ₹7.50 per $); IMF loan conditions
1969	Bank Nationalisation	14 major commercial banks nationalised; banking reached rural areas
1975	NABARD established	Apex bank for agriculture and rural development; SHG-bank linkage
1985	Rajiv Gandhi reforms	IT & telecom push; computerisation; modernisation of industry
1991	LPG Reforms	Balance of Payment crisis led to liberalisation, privatisation, globalisation; Narasimha Rao-Manmohan Singh
1993	Rao Committee (Tax Reforms)	LTCG tax introduced; moderate reforms in direct & indirect taxes
2000	FDI reforms accelerated	Automatic route in many sectors; cap raised; economic liberalisation deepened
2005	NREGA (MGNREGA)	Right to work; 100 days employment guarantee; world's largest public works programme
2008	Global Financial Crisis	India's growth slowed to 6.7%; stimulus packages launched; banking sector resilient
2013	NFSA (Food Security Act)	67% population covered; 5 kg food grains/person/month at ₹2-3
2016	Demonetisation	₹500 & ₹1000 notes withdrawn; 86% currency invalidated; push for digital payments; UPI surged
2017	GST launched	One nation one tax; replaced 17+ indirect taxes; dual structure (CGST, SGST, IGST)
2020	COVID-19 & Atmanirbhar	Pandemic hit economy; Atmanirbhar Bharat Abhiyan (₹20 lakh crore); PLI scheme
2022	UPI records	UPI transactions crossed ₹149 lakh crore/month; world's largest real-time digital payment system

Economic Reforms Timeline — Key Policy Decisions

Industrial licensing (1991)Abolished except for 18 strategic industries; delicensing opened most sectors to private investment

MRTP Act relaxation (1991)Companies no longer needed government approval for capacity expansion, mergers, or new projects

FEA to FEMA (1999)Foreign Exchange Regulation Act replaced by Foreign Exchange Management Act — liberalised forex management

Tariff reduction (1991-2000s)Customs duty reduced from 150%+ to ~10-15%; made imports cheaper; promoted competition

Banking reforms (1991-2000s)Narasimham Committee I & II — capital adequacy norms, entry of private & foreign banks, NPA reduction

Insurance liberalisation (1999)IRDA established; FDI in insurance up to 26% (now 74%); private players allowed

Telecom revolution (1990s-2000s)New Telecom Policy 1999; revenue sharing; entry of Reliance, Bharti; telecom density skyrocketed

IT boom (2000s)India became IT services hub; $250+ billion IT-BPM exports; TCS, Infosys, Wipro global leaders

Banking consolidation (2019-)10 PSUs merged into 4 (PNB, Union Bank, Canara Bank, Indian Bank); fewer but stronger PSBs

PMJDY (2014)50+ crore Jan Dhan accounts; financial inclusion; RuPay cards; Aadhaar-linked

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Exam strategy: For MCQs, focus on: (1) Exact dates of key reforms, (2) Committees and their recommendations, (3) Definitions with exact wording, (4) Numerical formula application. For long answers, structure: Definition → Explanation → Diagram → Examples → Conclusion. Always draw PPC, demand/supply curves, and cost curves when relevant.

Important Government Schemes (Quick Reference)

Scheme	Ministry / Year	Objective	Key Features
PM-KISAN	Agriculture, 2019	Income support to farmers	₹6,000/year in 3 instalments to all landholding farmer families
Ayushman Bharat	Health, 2018	Universal health insurance	₹5 lakh health cover per family/year for bottom 40%; covers 10+ crore families
PM Awas Yojana	Housing, 2015	Housing for all by 2022	Pucca houses for EWS/LIG in rural & urban areas; subsidy on interest
Swachh Bharat	Urban Dev, 2014	Clean India	Sanitation coverage; ODF villages; 100M+ toilets built; changed behaviour
Skill India / PMKVY	Skill Dev, 2015	Skill training for youth	Short-term training courses; 40 crore people to be skilled by 2022

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Final reminder: Economics is not just about memorising — understand the logicbehind each concept. Why does the demand curve slope downward? (Diminishing marginal utility.) Why is MC U-shaped? (Law of variable proportions.) Why is the multiplier positive? (One person's spending is another's income.) Understanding > memorisation.

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