In this guide
Few topics generate as many small, precise Prelims questions as national income accounting. The terms sound alike — GDP, GNP, NNP, GVA — and each comes in versions at "market prices", "basic prices" and "factor cost". But they are all built from a single idea, adjusted step by step. Learn the steps and the whole family falls into place.
The core idea
Gross Domestic Product (GDP) is the market value of all final goods and services produced within the country's borders in a given period, usually a year or a quarter.
Three words in that definition do the work:
- Final — to avoid double counting, we count only goods and services sold to final users, not intermediate inputs. (Counting both the flour and the bread made from it would count the flour twice.)
- Produced — second-hand sales and pure financial transfers are not new production.
- Within the country — "domestic" means the geographical territory, regardless of who owns the factors of production.
From domestic to national
Gross National Product (GNP) adds the income that residents earn abroad and subtracts the income that foreigners earn in the country.
GNP = GDP + Net factor income from abroad
For India, net factor income from abroad is negative (more income flows out as profits, interest and dividends than flows in as factor income), so GNP is slightly less than GDP.
From gross to net
Production wears out machines and buildings. Depreciation (consumption of fixed capital) is subtracted to get the net measures.
NNP = GNP − Depreciation
NDP = GDP − Depreciation
Market prices, basic prices, factor cost
This is where most confusion arises. The question is: which taxes and subsidies are included in the value?
| Valuation | Includes |
|---|---|
| Factor cost | Only payments to factors of production — wages, rent, interest, profit |
| Basic prices | Factor cost + production taxes − production subsidies (taxes and subsidies not linked to the quantity of output, such as land revenue or stamp duties) |
| Market prices | Basic prices + product taxes − product subsidies (taxes and subsidies per unit of product, such as GST or fertiliser subsidy) |
So:
GVA at basic prices = GVA at factor cost + Production taxes − Production subsidies
GDP at market prices = GVA at basic prices + Product taxes − Product subsidies
National income in the traditional sense is NNP at factor cost.
What is GVA?
Gross Value Added (GVA) measures output from the supply side: for each sector, the value of its output minus the value of intermediate inputs used. Summing GVA across agriculture, industry and services gives the economy's total GVA.
- GVA is useful for seeing which sectors are growing.
- GDP is useful for seeing the economy as a whole from the demand side — consumption, investment, government spending and net exports.
Since the revision of India's national accounts with base year 2011–12, the Central Statistics Office (now part of the NSO) has reported sectoral growth in terms of GVA at basic prices and headline growth in terms of GDP at market prices, in line with international practice. The base year is periodically revised to reflect the changing structure of the economy.
Three ways to measure GDP
| Method | What it adds up |
|---|---|
| Production (value added) | Value added in each sector of the economy |
| Income | Incomes earned — wages, rent, interest, profits (plus mixed income of the self-employed) |
| Expenditure | Private consumption + Investment + Government consumption + (Exports − Imports) |
In principle, all three give the same answer. In practice, differences arise from data gaps and are shown as statistical discrepancies.
Nominal and real GDP
- Nominal GDP — valued at current prices.
- Real GDP — valued at the constant prices of a base year, removing the effect of inflation.
GDP deflator = (Nominal GDP ÷ Real GDP) × 100
Real GDP growth is what is usually reported as "economic growth". Nominal GDP matters for fiscal ratios — the fiscal deficit and debt are expressed as shares of nominal GDP.
Per capita income
Dividing national income by population gives per capita income — a rough indicator of average living standards, though it says nothing about distribution.
What GDP does not capture
Mains questions often ask about the limits of GDP as a measure of well-being:
- Unpaid work — household work and care, largely done by women, is excluded.
- The informal sector — hard to measure accurately in India, where a large share of employment is informal.
- Distribution — GDP can grow while inequality widens.
- Environmental damage — depletion of natural resources and pollution are not subtracted; clean-up activity even adds to GDP.
- Quality of life — health, education, leisure and security are only partly reflected.
Alternatives and complements include the Human Development Index, green GDP or natural capital accounting (India has published environmental accounts through MoSPI), happiness indices and multidimensional poverty measures.
Quick practice
Suppose GVA at basic prices is ₹100, product taxes are ₹12 and product subsidies are ₹2. GDP at market prices = 100 + 12 − 2 = ₹110. If net factor income from abroad is −₹1, GNP at market prices = ₹109.
Practice questions
- Prelims-type: Which of these is traditionally called national income — GDP at market prices, NNP at factor cost, GVA at basic prices?
- Prelims-type: Why is India's GNP lower than its GDP?
- Mains-type (150 words): Distinguish between GVA and GDP. Why does India report sectoral growth in terms of GVA?
A note on dates and numbers. Exam patterns, vacancies and schedules change from year to year. Always confirm the current details in the latest notification on the Union Public Service Commission website .
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