In this guide
Inflation is one of those topics everyone thinks they understand until they try to answer a question about it. What exactly does "four per cent inflation" measure? Why did India switch from WPI to CPI? Why does the RBI sometimes raise rates when food prices rise and sometimes not? This guide builds the concepts from the ground up.
What inflation is
Inflation is a sustained rise in the general level of prices in an economy — equivalently, a fall in the purchasing power of money. A rise in the price of one item is not inflation; a broad rise across goods and services is.
Related terms:
- Deflation — a sustained fall in the general price level.
- Disinflation — a slowdown in the rate of inflation (prices still rising, but more slowly).
- Stagflation — high inflation combined with stagnant growth and high unemployment.
- Reflation — deliberate policy action to push prices and demand back up after a slump.
What causes it
| Type | Cause | Example |
|---|---|---|
| Demand-pull | Aggregate demand grows faster than supply | Strong consumer spending, loose monetary policy, large fiscal stimulus |
| Cost-push | Rising costs of production pushed onto prices | Higher crude oil prices, wage increases, costlier inputs |
| Structural | Supply bottlenecks in particular sectors | Poor storage and supply chains for food; low productivity in agriculture |
| Imported | Rising prices of imports, or a weaker rupee | Global commodity price spikes |
| Built-in (expectations) | People expect prices to rise, and wages and prices adjust in advance | A wage–price spiral |
In India, food and fuel have historically been major sources of inflation, and supply shocks — a poor monsoon, a vegetable price spike — often drive headline numbers.
How India measures inflation
Consumer Price Index (CPI)
- Compiled by the National Statistics Office (NSO) under the Ministry of Statistics and Programme Implementation.
- Measures changes in the retail prices of a basket of goods and services that households buy.
- Published for rural, urban and combined India. CPI (Combined) is the headline number.
- Food and beverages have a large weight in the basket — close to half in the series that has been in use for most of the past decade — which is why food price shocks move CPI so much.
- The base year is revised periodically to reflect changing consumption patterns.
Wholesale Price Index (WPI)
- Compiled by the Office of the Economic Adviser, Department for Promotion of Industry and Internal Trade (DPIIT).
- Measures prices at the wholesale level for goods only — primary articles, fuel and power, and manufactured products. It does not include services.
- Base year 2011–12.
The GDP deflator
- The ratio of nominal GDP to real GDP.
- Covers all goods and services produced in the economy, not a fixed basket.
- Available only quarterly and with a lag, so it is less useful for policy.
| Feature | CPI | WPI |
|---|---|---|
| Measures | Retail prices paid by consumers | Wholesale prices of goods |
| Services included | Yes | No |
| Compiled by | NSO (MoSPI) | Office of the Economic Adviser (DPIIT) |
| Used for RBI target | Yes | No |
| High weight | Food | Manufactured goods |
Headline and core inflation
- Headline inflation — the overall CPI inflation rate, including everything.
- Core inflation — inflation excluding volatile items, usually food and fuel.
Core inflation shows the underlying, more persistent trend in prices. A central bank watches it closely because monetary policy works on demand over time, while food and fuel prices often jump because of supply shocks that interest rates cannot fix quickly.
Inflation targeting in India
- Following the recommendations of the Urjit Patel committee (2014), India adopted flexible inflation targeting.
- The RBI Act was amended in 2016 to give it a statutory basis and to create the Monetary Policy Committee (MPC).
- The target is 4 per cent CPI inflation, with a tolerance band of 2 to 6 per cent. The government sets the target in consultation with the RBI and reviews it every five years.
- If inflation stays outside the band for three consecutive quarters, the RBI must report to the government explaining the reasons and its planned response.
"Flexible" means the RBI also keeps growth in mind; it is not required to hit the target at any cost.
Why target CPI and not WPI?
- CPI reflects the cost of living that households actually face.
- It includes services, which are a large and growing share of the economy.
- Inflation expectations of households are shaped by retail prices.
The main criticism is that CPI's large food weight means monetary policy may respond to supply shocks it cannot control. Supporters answer that persistent food inflation feeds into wages and expectations, so it cannot be ignored.
Effects of inflation
| Who or what | Effect |
|---|---|
| The poor | Hurt most — a larger share of income goes on food and essentials; savings are rarely protected |
| Savers and fixed-income earners | Real value of savings and pensions falls |
| Borrowers | Real burden of debt falls |
| Government | Nominal revenues rise; but interest costs and subsidy bills may also rise |
| Exports | May become less competitive if domestic inflation exceeds that of trading partners |
| Investment | High and volatile inflation creates uncertainty and discourages long-term investment |
Moderate, stable inflation is generally considered compatible with growth. Very high inflation — or deflation — is damaging.
Controlling inflation
- Monetary policy — raising the repo rate and tightening liquidity to cool demand.
- Fiscal policy — reducing the fiscal deficit; rationalising subsidies.
- Supply-side measures — better storage and cold chains, releasing buffer stocks, import duty cuts, export restrictions on essential commodities, improving agricultural productivity.
For food inflation in particular, supply-side measures often matter more than interest rates.
Practice questions
- Prelims-type: Which index does not include services? What is the tolerance band around India's inflation target?
- Mains-type (150 words): Distinguish between headline and core inflation. Why does the RBI watch both?
- Mains-type (250 words): "Monetary policy alone cannot control food inflation in India." Discuss.
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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