GDP, GNP, NDP, NNP (Nominal vs Real)

GDP, GNP, NDP, NNP (Nominal vs Real)

Concept Explanation

Let me give this to you straight — these terms sound intimidating but they’re actually common sense dressed up in economics language. Think of it this way: if you run a paan shop and your sales go from ₹1 lakh to ₹1.5 lakh, did you actually sell 50% more goods? Maybe, but maybe you just raised prices because onions got expensive. That’s the whole game — separating actual volume growth from price growth.

Nominal GDP uses current market prices — whatever things actually sold for this year. Real GDP uses constant base-year prices — it asks “what would these goods have cost if prices were frozen at the base year?” The difference tells you true economic growth stripped of inflation.

GDP at market prices includes indirect taxes (GST, excise) and subtracts subsidies. GDP at factor cost is what producers actually receive before taxes are added and subsidies removed. The formula is: GDP at factor cost = GDP at market prices − Indirect Taxes + Subsidies.

Now GNP is where geography meets ownership. India’s GNP includes profits of an Indian IT company operating in the US (because Indians own it) but excludes profits of a US company operating in India (because Americans own it). That’s why GNP = GDP + Net Factor Income from Abroad. For India, NFIA is typically negative because foreign companies earn more in India than Indian companies earn abroad — meaning GNP is usually lower than GDP.

NDP (Net Domestic Product) is simply GDP minus depreciation — the wearing out of machines, buildings, and infrastructure. NDP answers: what new value did we actually add, net of what we used up? It’s a more honest number because GDP counts gross investment including replacement of old capital; NDP subtracts that maintenance cost.

Key Terms & Definitions

Term	Definition
Nominal GDP	Total value at current market prices (includes inflation)
Real GDP	GDP measured at constant base-year prices (inflation-adjusted)
GDP Deflator	(Nominal GDP / Real GDP) × 100 — measures average price level
GDP at Market Prices	Includes indirect taxes, excludes subsidies
GDP at Factor Cost	Excludes indirect taxes, includes subsidies
GNP	GDP + Net Factor Income from Abroad
NNP	GNP − Depreciation (also called National Income at market prices)
Per Capita Income	National Income / Population
GVA	Gross Value Added — sectoral output before netting taxes

Real-World Example (RBI Context)

In January 2015, CSO shifted the base year from 2004-05 to 2011-12. This wasn’t just a number change — it restated India’s growth story. Old series showed India growing at 4.7% in 2012-13; the new series showed 6.9% for the same year. Same economy, different measurement. This matters for RBI because monetary policy decisions — repo rate cuts or pauses — are calibrated against GDP growth projections. Also, GVA (Gross Value Added) replaced GDP at factor cost as the primary measure in the new series, giving a slightly different picture of sectoral contributions.

Exam Pattern / How It Appears

Questions are typically:

• Numerical: Calculate real GDP given nominal GDP and inflation/deflator
• Conceptual: Difference between GDP at market prices vs factor cost
• Case-based: Interpret a table of GDP, GNP, NNP figures for India vs other countries

Step-by-Step Example

Q: Nominal GDP = ₹150 lakh crore, GDP deflator = 120. What is Real GDP? Answer: Real GDP = Nominal GDP / Deflator × 100 = 150 / 120 × 100 = ₹125 lakh crore. The deflator of 120 means prices are 20% higher than base year, so real output is lower than nominal.

Q: If GDP at market prices = ₹160 lakh crore, Indirect Taxes = ₹20 lakh crore, Subsidies = ₹5 lakh crore, find GDP at factor cost. Answer: GDP at factor cost = GDP at market prices − Indirect Taxes + Subsidies = 160 − 20 + 5 = ₹145 lakh crore.