GDP, GNP, NNP and national income: the differences for UPSC economy

GDP, GNP, NNP and national income are usually taught as four definitions with four formulas. They are better understood as a single chain, where each step adds or removes exactly one thing.

Once the chain is clear, the formulas become descriptions rather than things to memorise. And the questions, which usually ask what a particular measure includes or excludes, become answerable by walking one step.

The chain

GDP: territory, not nationality

GDP is the market value of all final goods and services produced within India's domestic territory in a year.

Three things follow from that definition.

Only final goods are counted. A tyre sold to a car factory is an intermediate good, and its value is already inside the price of the car. Counting both would double-count the tyre. The same tyre sold to you as a replacement is a final good.

Production inside India counts, whoever owns the factory. A Japanese car plant in Chennai adds to India's GDP. An Indian engineer working in California does not, because the production happened outside the territory.

Market price is the price the buyer pays, so indirect taxes are included and subsidies are not subtracted. That is why GDP at market price is larger than the value of what the factors of production actually earn.

GNP: adding the Indian connection abroad

GNP is GDP plus net factor income from abroad.

Factor income is the return on labour and capital: wages, interest, dividends, profits. Net means income earned by Indians from assets abroad, minus income earned by foreigners from assets in India.

For India, that number has usually been negative. Foreign companies operating here repatriate more profit than Indian residents earn from assets abroad, so GNP sits below GDP. In economies with large outward investment, the relationship reverses.

That last row is where a great many answers go wrong. Remittances are not factor income. They belong in the current account of the balance of payments, and they do not enter GNP.

NNP: subtracting wear and tear

Machines wear out, buildings age, roads deteriorate. This consumption of fixed capital is depreciation, and both GDP and GNP ignore it. They measure production without asking how much of the capital stock was used up producing it.

NNP is GNP minus depreciation. It is the net addition to the economy rather than the gross one, and for that reason it is a more honest measure of what has actually been added in a year.

NNP is still at market price at this stage. The final step converts it into what the factors of production earn.

National income: what people actually earn

Market price includes indirect taxes. When you buy something, part of what you pay is GST, and that part is not earned by the worker or the company. To get to factor incomes, you remove indirect taxes and add back subsidies.

National income, or NNP at factor cost, is therefore NNP at market price minus indirect taxes plus subsidies. It equals compensation of employees, rent, interest, profit, and the mixed income of the self-employed.

This is the measure closest to what the economy generates for the people in it, which is why the term is used interchangeably with national income in most textbooks.

The 2015 change

In January 2015, the Central Statistics Office changed two things about how India reports national income.

It moved the headline measure from factor cost to market price, aligning with the UN System of National Accounts and making the data internationally comparable. It also changed the base year from 2004-05 to 2011-12, which incorporated newer data sources and a more current picture of the economy.

Both changes produced a one-time jump in reported GDP. The economy had not suddenly grown faster; the measurement had become broader. That distinction matters whenever a series is compared across the revision, and it is the kind of detail a statement-based question can turn on.

What the chain does not measure

GDP says nothing about welfare, and the exam likes that point.

Household work and care are not counted because no market transaction occurs. Environmental damage is not subtracted, so a country can grow by depleting its forests. Distribution is invisible: two economies with the same GDP per capita can have very different poverty. And a rise in output that comes from longer hours is not distinguished from one that comes from better technology.

The chain measures production. Everything else is an interpretation, and the interpretations are where Mains answers earn their marks.

If the external accounts are the next gap, current account versus capital account picks up where NFIA stops. For the policy side, demand-pull versus cost-push inflation shows how these aggregates move in practice, and the weightage guide shows how often they are asked.