National income accounting and basic macroeconomic concepts form the foundation of UPSC Economy. GDP, GNP, NNP, and related aggregates — along with the calculation methods — are asked almost every year.
GDP and Related Aggregates
| Concept | Definition / Formula |
|---|---|
| GDP (Gross Domestic Product) | Total market value of all final goods & services produced within a country's borders in a year, regardless of who produces them |
| GNP (Gross National Product) | GDP + Net Factor Income from Abroad (NFIA = income earned by residents abroad − income earned by foreigners in India) |
| NNP (Net National Product) | GNP − Depreciation (consumption of fixed capital) |
| National Income (NI) | NNP at Factor Cost = NNP at Market Prices − Net Indirect Taxes (Indirect Taxes − Subsidies) |
| Per Capita Income | National Income ÷ Population |
| Personal Income | NI − Undistributed corporate profits − Corporate taxes + Transfer payments |
| Disposable Personal Income | Personal Income − Personal Taxes |
GNP = GDP + NFIA | NNP = GNP − Depreciation | NI = NNPMP − Net Indirect Taxes
Methods of Calculating National Income
| Method | Approach | Avoids |
|---|---|---|
| Output / Product Method | Sum of value added at each stage of production; counts only final goods (avoids double counting) | Double counting via value added |
| Income Method | Sum of all factor incomes: wages + rent + interest + profit | Transfer payments (pensions, scholarships) excluded |
| Expenditure Method | GDP = C + I + G + (X − M); C=consumption, I=investment, G=govt. expenditure, X−M=net exports | Intermediate goods expenditure |
Types of GDP
- Nominal GDP — measured at current prices; affected by price changes
- Real GDP — measured at constant prices (base year); reflects actual growth
- GDP Deflator = (Nominal GDP / Real GDP) × 100; broader inflation measure than CPI/WPI
- India's base year for GDP: 2011–12 (revised from 2004–05)
- India's GDP calculated by CSO (now MoSPI) using output + expenditure methods
Types of Economies
| Type | Features | Example |
|---|---|---|
| Capitalist / Market Economy | Private ownership; price mechanism; profit motive; minimal govt. intervention | USA |
| Socialist Economy | State ownership of means of production; central planning; equality focus | Former USSR, Cuba |
| Mixed Economy | Both public and private sectors; market + planning; India's model | India, France |
| Closed Economy | No foreign trade; self-sufficient; theoretical concept | — |
| Open Economy | International trade; FDI allowed; most modern economies | Most countries |
Sectors of the Economy
- Primary Sector — agriculture, mining, fishing, forestry (~18% of India's GDP; ~45% employment)
- Secondary Sector — manufacturing, construction, electricity (~28% of GDP)
- Tertiary / Services Sector — trade, banking, IT, transport (~54% of GDP; fastest growing)
- India: services-led growth; unusual structural transformation (jumped from primary to services, skipping large-scale manufacturing)
Key: India uses GDP (not GNP) as primary indicator. Base year: 2011–12. MoSPI publishes National Accounts. "Real GDP" = actual growth; "Nominal GDP" includes price effects. GDP Deflator is broader than CPI/WPI.