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NISM-Series-XV: Research Analyst · Economic Analysis

Macroeconomic Indicators: GDP, Inflation and IIP

Updated 11 October 2026 · Fact-checked

Macroeconomic indicators measure how an economy is performing. GDP measures the value of final goods and services produced within a country in a period. Inflation (CPI, WPI) measures the rise in price levels. IIP measures changes in the volume of industrial output. To solve questions, identify the measure, its scope and its formula.

Understand Macroeconomic Indicators: GDP, Inflation and IIP

A macroeconomic indicator is a statistic that tells you how the whole economy is doing. A research analyst uses these numbers to judge whether demand, costs and profits are likely to rise or fall.

GDP (Gross Domestic Product) is the market value of all final goods and services produced within the geographical borders of a country in a period. Only final goods count. Intermediate goods are left out to avoid double counting. It counts output by anyone, Indian or foreign, inside India.

GNP (Gross National Product) counts output by a country's own residents, wherever they produce it. So GNP = GDP + net factor income from abroad. The difference is about location (GDP) versus ownership or nationality (GNP).

Nominal GDP uses current prices. Real GDP uses constant base-year prices and removes the effect of price changes, so it shows true growth. The GDP deflator = (Nominal GDP ÷ Real GDP) × 100. GDP can be computed by three approaches: the production (value added) approach, the expenditure approach and the income approach. In principle they give the same figure.

Inflation is a sustained rise in the general price level. CPI (Consumer Price Index) tracks retail prices of a basket that households buy, including food, housing, fuel, clothing and services. WPI (Wholesale Price Index) tracks prices at the wholesale stage and covers goods only, with no services. Inflation rate = (Index now − Index a year ago) ÷ Index a year ago × 100. Note that RBI's inflation target under its monetary policy framework is based on CPI.

IIP (Index of Industrial Production) measures changes in the volume of production in the industrial sector against a base year. It covers mining, manufacturing and electricity. It is a short-term indicator released monthly, and it is read as a growth rate, not as a level of output in rupees.

Key formulas to remember

Expenditure approach
GDP = C + I + G + (X − M)
C = private consumption, I = investment, G = government spending, X − M = net exports. Imports are subtracted.
Income approach
GDP = Wages + Rent + Interest + Profit (+ depreciation and net indirect taxes, at market prices)
Adds up incomes earned by factors of production. Adjustments are needed to move between factor cost and market price.
GNP
GNP = GDP + Net factor income from abroad
Net factor income = income earned by residents abroad − income earned by foreigners in the country.
Real GDP and deflator
GDP deflator = (Nominal GDP ÷ Real GDP) × 100
Real GDP = Nominal GDP ÷ deflator × 100. Real GDP removes price effects.
Net and market price links
NDP = GDP − Depreciation; GDP at market price = GDP at factor cost + Indirect taxes − Subsidies
Net means after depreciation. Factor cost excludes taxes and adds back subsidies.
Inflation rate
Inflation (%) = (Index this year − Index last year) ÷ Index last year × 100
Works for CPI or WPI. It is the percentage change in the index.

How to solve Macroeconomic Indicators: GDP, Inflation and IIP questions

Most questions on this topic test definitions, scope differences or a simple calculation. Use this method.

  1. 1Read the question and name the indicator: GDP, GNP, CPI, WPI, IIP or deflator.
  2. 2Check the scope the question hints at: location or nationality, goods only or goods and services, retail or wholesale, volume or value.
  3. 3If it is a calculation, write the matching formula first, then insert the numbers.
  4. 4Check whether figures are nominal or real, and whether an index needs converting to a percentage change.
  5. 5Do the arithmetic slowly and keep units consistent (₹ crore, index points, percent).
  6. 6Test each option against the scope you identified and remove the ones that break it.
  7. 7Confirm the sign and direction: net exports can be negative, and a falling index means falling prices or output.

Quickest way: Scope-keyword shortcut

When to use it: Use for definition and difference questions where time is short.

  1. GDP: think 'within borders'. GNP: think 'own residents'.
  2. CPI: think 'consumer, retail, includes services'. WPI: think 'wholesale, goods only'.
  3. IIP: think 'volume index of mining, manufacturing, electricity'.
  4. Calculation: expenditure approach is C + I + G + (X − M); inflation is the percentage change in the index.
  5. Pick the option whose keyword matches the scope in the stem.

Common mistakes in Macroeconomic Indicators: GDP, Inflation and IIP

  • Treating GDP and GNP as the same or reversing them

    Both sound alike and both are totals of output.

    Fix: Remember GDP is by location, GNP is by nationality. GNP = GDP + net factor income from abroad.

  • Saying WPI includes services

    Students assume any price index covers the whole economy.

    Fix: WPI covers goods only. CPI includes both goods and services.

  • Adding imports in the expenditure approach

    Students remember X and M but forget the sign.

    Fix: Use net exports (X − M). Imports are subtracted because they are production elsewhere.

  • Calling a rise in nominal GDP real growth

    Price increases inflate the nominal figure.

    Fix: Real growth needs constant prices. Check whether the number is nominal or real.

  • Reading IIP as a measure of the whole economy or of services

    IIP is published often and gets headline attention.

    Fix: IIP covers only mining, manufacturing and electricity, and measures volume change against a base year.

  • Computing inflation by dividing by the current index

    Rushing and using the wrong base.

    Fix: Divide the change by the earlier (base) index value.

Worked examples

Example 1

An economy has C = ₹60,00,000 crore, I = ₹20,00,000 crore, G = ₹15,00,000 crore, exports = ₹10,00,000 crore and imports = ₹12,00,000 crore. Find GDP by the expenditure method.

Show the solution
  1. Write the formula: GDP = C + I + G + (X − M).
  2. Net exports = 10,00,000 − 12,00,000 = −₹2,00,000 crore.
  3. C + I + G = 60,00,000 + 20,00,000 + 15,00,000 = ₹95,00,000 crore.
  4. GDP = 95,00,000 − 2,00,000 = ₹93,00,000 crore.

Answer: GDP = ₹93,00,000 crore.

Example 2

CPI was 150 a year ago and is 162 now. Separately, a country's GDP is ₹200 lakh crore and net factor income from abroad is −₹3 lakh crore. Find the inflation rate and GNP.

Show the solution
  1. Inflation = (162 − 150) ÷ 150 × 100.
  2. 12 ÷ 150 = 0.08, so inflation = 8%.
  3. GNP = GDP + net factor income from abroad.
  4. GNP = 200 + (−3) = ₹197 lakh crore.

Answer: Inflation is 8% and GNP is ₹197 lakh crore, lower than GDP because net factor income is negative.

Exam tips

  • Expect direct 'which of the following is correct' questions on GDP versus GNP and CPI versus WPI. Learn the scope keywords.
  • Watch for words such as 'only', 'always' and 'includes services'. They are common trap markers.
  • For calculations, write the formula before the numbers. Most errors are sign errors on imports or net factor income.
  • Wrong answers cost 25% of the question's marks, so skip a question only if you cannot narrow it to two options.
  • Know that IIP is a volume index with a base year and covers mining, manufacturing and electricity.

Practice questions from Economic Analysis

Macroeconomic Indicators: GDP, Inflation and IIP: frequently asked questions

What is the difference between GDP and GNP?

GDP counts output produced within a country's borders, whoever produces it. GNP counts output of a country's residents, wherever they produce it. GNP = GDP + net factor income from abroad.

What is the difference between CPI and WPI?

CPI measures retail prices paid by consumers and includes services. WPI measures wholesale prices and covers goods only. CPI is the basis of RBI's inflation target.

How is GDP calculated by the expenditure and income methods?

The expenditure method adds consumption, investment, government spending and net exports: C + I + G + (X − M). The income method adds the incomes earned by factors of production, such as wages, rent, interest and profit, with adjustments for depreciation and indirect taxes.

What does the Index of Industrial Production measure?

IIP measures changes in the volume of industrial output against a base year. It covers mining, manufacturing and electricity. It is a monthly short-term indicator of industrial activity.