Economy · Explained
Inflation is not simply “prices going up”. It is a sustained rise in the general price level that reduces the purchasing power of money. This explainer shows what causes inflation in India, how we measure it, why food inflation behaves differently, and how the RBI and government respond.
In one line
Inflation = a sustained increase in the general price level. In India, the policy anchor is headline CPI inflation. The government has retained a 4% CPI inflation target with a 2% to 6% tolerance band for 1 April 2026 to 31 March 2031.
What exactly is inflation?
Inflation means a sustained rise in the general level of prices of goods and services over time. The key word is “general”. If only onions become expensive because a crop is damaged, that is a price shock. It becomes an inflation problem when price pressures spread across a wider part of the economy and persist.
Inflation also means a fall in the purchasing power of money. If a basket of goods that costs ₹1,000 today costs ₹1,050 next year, the price level has risen by 5%. Your ₹1,000 has not disappeared, but it buys less than before.
Interactive: What does 5% inflation do to ₹1,000?
Move the slider to change the inflation rate. The example assumes the same basket of goods and shows how much it would cost after one year.
Inflation rate: 5.0%
₹1,050
At 5% inflation, a basket costing ₹1,000 today would cost about ₹1,050 next year.
Inflation is a rate of change, not the price level itself
This distinction is extremely important. The price index tells us the level of prices relative to a reference period. The inflation rate tells us how quickly that index is changing.
Suppose the CPI index rises from 100 to 105. The price level is 5% higher than in the reference period. If the CPI then rises from 105 to 107.1, inflation over that period is about 2%, even though prices are still higher than they were earlier.
Why does inflation happen?
There is rarely one single cause. The framework in the attached Reserve Bank of Australia explainer is useful because it groups the main mechanisms into demand-pull inflation, cost-push inflation and inflation expectations. The same economic logic can be applied to India, while adding India-specific channels such as food supply shocks, imported inflation and exchange-rate movements. The source explainer makes the same distinction between demand-side pressure, supply-side costs and expectations.
1. Demand-pull inflation: too much demand for available supply
Demand-pull inflation occurs when total demand for goods and services rises faster than the economy's ability to supply them sustainably. When buyers compete for limited output, firms get greater pricing power.
Think about a strong economic recovery. Households spend more, businesses invest more and government spending rises. If factories, workers, transport networks and other productive capacity cannot expand quickly enough, demand begins to outrun supply.
Interactive: Demand meets supply
Move the demand slider. The diagram illustrates why prices can rise when demand moves beyond available productive capacity.
input id="demandSlider" class="eg-slider" type="range" min="35" max="95" value="55">Demand pressure: 55
At moderate demand pressure, firms can respond by producing more. Inflationary pressure is limited.
The attached source explains this mechanism through aggregate demand and aggregate supply: when demand exceeds potential output, prices face upward pressure; when demand is below potential output, inflation pressure can weaken.
2. Cost-push inflation: production becomes more expensive
Cost-push inflation begins on the supply side. If the cost of producing something rises, firms may reduce output, raise prices, or do both.
In India, common examples include crude oil, natural gas, imported raw materials, transport costs, electricity, wages and agricultural inputs. A crude oil shock can move through the economy because fuel is not just a consumer item. It is also an input into transport, logistics, manufacturing and agriculture.
The same chain can work through food. A weather shock that damages vegetables can reduce supply and push vegetable prices higher. If the shock is broad or persistent, it can feed into household inflation expectations and wage demands.
The source explainer gives the same basic supply-chain logic: higher input costs can reduce output and raise prices, while an oil-price increase can raise transport costs and then affect the prices of other goods.
3. Imported inflation: when the outside world becomes more expensive
India imports several important commodities and intermediate inputs. When global prices rise, Indian import costs can rise as well. Exchange-rate movements can amplify this effect.
For example, if international crude becomes more expensive and the rupee also depreciates against the US dollar, the rupee cost of importing crude can rise more sharply. That can affect transport, logistics and production costs and eventually consumer prices.
A weaker rupee can also make imported machinery, electronics, chemicals and other inputs more expensive. The RBA explainer describes this two-way channel clearly: currency depreciation raises the domestic price of imports and can also shift demand towards domestic goods because imports become relatively more expensive.
4. Inflation expectations: what people think can become what actually happens
Inflation is partly about expectations. If households and businesses become convinced that prices will keep rising, they may change their behaviour today.
A worker may seek a higher wage because they expect living costs to rise. A business may raise prices in anticipation of higher wages and input costs. Consumers may bring purchases forward because they expect goods to become more expensive. These decisions can themselves add to demand and costs.
Interactive: Anchored vs unanchored expectations
Anchored expectations: people believe a temporary inflation shock will eventually fade and inflation will return towards the central bank's target. They are less likely to build the temporary shock permanently into wages and prices.
The attached source emphasises that expectations can become self-reinforcing and that inflation is easier for a central bank to manage when expectations remain anchored.
Food inflation: why India needs special attention
Food has a much larger role in Indian household consumption than in many advanced economies. That makes food-price shocks especially important for headline CPI inflation and household welfare.
Food prices can move because of monsoon conditions, temperature, crop disease, harvest size, storage losses, transport bottlenecks, global commodity prices, export-import policies and sudden changes in demand. Monetary policy cannot grow more tomatoes or repair a damaged crop overnight.
This creates an important policy distinction: a temporary vegetable-price shock may require supply-side action rather than an aggressive interest-rate response. But if food shocks become broad, persistent and begin influencing wages and expectations, monetary policy becomes more relevant.
What are headline and core inflation?
Headline inflation covers the overall CPI basket. It includes food and fuel-related items. This is the inflation measure used as the formal target under India's flexible inflation-targeting framework.
Core inflation is commonly used as an analytical measure that excludes volatile food and fuel components. It can help policymakers assess underlying price pressures, although the exact definition can vary across analysis.
The distinction matters because headline inflation can move sharply due to a vegetable, crude oil or other supply shock even when broader demand conditions remain relatively stable.
How is inflation measured in India?
India uses several price measures, each answering a different question. The most important for monetary policy is Consumer Price Index (CPI). WPI and the GDP deflator provide additional perspectives.
| Measure | What it tells us | Why it matters |
|---|---|---|
| CPI | Change in retail prices of a basket of goods and services consumed by households. | India's headline inflation target is defined in terms of CPI. |
| CFPI | Consumer Food Price Index tracks changes in food prices within the consumer basket. | Important because food has a major influence on household inflation. |
| WPI | Wholesale price movements, primarily covering goods. | Useful for understanding upstream/wholesale price pressures. |
| GDP deflator | Broad price measure covering domestically produced final goods and services in GDP. | Useful for economy-wide price changes rather than a fixed consumer basket. |
What is the Producer Price Index (PPI)?
The Producer Price Index (PPI) measures changes in the prices that producers receive for their goods and services at different stages of production. It looks at inflation from the producer's point of view, rather than the prices finally paid by consumers.
In simple terms, CPI asks, “What are consumers paying?” PPI asks, “What prices are producers receiving?” Because producer prices can change before those changes reach retail markets, producer-price measures can provide an early indication of emerging price pressures.
The producer-price concept also differs from the final consumer price because taxes, transport costs, trade margins and retail mark-ups may be added before a product reaches the consumer. For India, WPI remains the principal official wholesale price measure; PPI should therefore be understood as a producer-price concept rather than confused with India's WPI.
The new CPI series: 2024 = 100
India's CPI underwent a major base-year revision in 2026. MoSPI moved the CPI base year from 2012=100 to 2024=100. The new series uses expenditure weights derived from the Household Consumption Expenditure Survey 2023-24, bringing the basket closer to current consumption patterns. citeturn1search5turn1search2
The revised all-India basket increased from 299 weighted items to 358, with goods increasing from 259 to 308 and services from 40 to 50. The new series also expands price collection and includes newer consumption categories, including online services. citeturn1search2
Interactive: What does a base year actually mean?
Change the base-year index below. The exercise shows why changing the base year does not mean that prices suddenly changed on the day the base year changed.
2012=100 meant that the average price level in the chosen reference period was assigned an index value of 100. Later prices were expressed relative to that reference.
MoSPI states that the new CPI series uses 2024 as the base because the expenditure weights are derived from HCES 2023-24 and the base-period prices were collected during January-December 2024, improving alignment between the weight and price reference periods. citeturn1search5
How is CPI inflation calculated?
For year-on-year inflation, the basic calculation is:
Inflation rate = [(CPI this month − CPI same month last year) ÷ CPI same month last year] × 100
This is the formula specified by MoSPI for the CPI 2024 series. citeturn1search5So, if the CPI was 105 last year and 109.2 this year, inflation would be approximately 4%. The index level and the inflation rate are related, but they are not the same thing.
How the RBI thinks about inflation
India follows a flexible inflation-targeting framework. The legal framework gives the Monetary Policy Committee responsibility for setting the policy rate needed to achieve the inflation target while keeping growth in mind.
For the period 1 April 2026 to 31 March 2031, the government has retained the CPI inflation target at 4%, with a lower tolerance level of 2% and an upper tolerance level of 6%. citeturn3search0turn3search1
Interactive: Understanding the 4% target
4% is the target, not a ceiling. The 2–6% band gives monetary policy room to deal with temporary shocks while keeping the medium-term objective centred on 4%.
How can inflation be controlled?
There is no single anti-inflation button. The appropriate response depends on what is causing the inflation.
Monetary policy
The RBI can use the policy repo rate and liquidity operations to influence financial conditions, borrowing costs, spending and inflation expectations. If inflation is driven by excessive aggregate demand, tighter monetary conditions can help cool demand. But monetary policy is less direct when the immediate cause is a crop failure or a global oil shock.
Fiscal policy
The government can influence aggregate demand through taxation and public expenditure. Fiscal measures can therefore complement monetary policy when demand is overheating.
Supply-side measures
These are especially important for food and commodity inflation. Measures can include releasing buffer stocks, improving logistics and storage, facilitating imports where appropriate, reducing supply bottlenecks and improving agricultural productivity.
Exchange-rate and trade channels
Exchange-rate movements influence imported prices. Trade and supply policies can therefore affect inflation, especially for commodities and intermediate goods where India depends significantly on international markets.
Why inflation matters to ordinary people
Inflation affects almost every economic decision because it changes the value of money over time.
Impacts of Inflation
Inflation is not just a statistic released every month. It changes how households save and spend, how businesses invest, and how borrowers and lenders are affected.
Erosion of savings. When prices rise, the purchasing power of money falls. If your savings earn 5% while inflation is 7%, your money may grow in rupee terms but lose purchasing power in real terms.
Borrowers and lenders are affected differently. Unexpected inflation can reduce the real burden of fixed-rate debt, benefiting borrowers. Lenders, however, receive repayments whose purchasing power is lower than expected.
Impact on the balance of payments. If domestic prices rise faster than those of trading partners, Indian goods can become relatively less competitive abroad, while imports may become more attractive. This can put pressure on the trade balance and, in turn, the balance of payments.
Greater uncertainty. When households and businesses cannot predict future prices, they may postpone consumption, investment and long-term contracts. Persistent uncertainty can therefore weaken economic activity and make business planning more difficult.
Inflation, disinflation, deflation and stagflation
| Term | Meaning | Simple example |
|---|---|---|
| Inflation | General price level is rising. | Prices rise 5% year-on-year. |
| Disinflation | Prices continue to rise, but the inflation rate falls. | Inflation falls from 6% to 4%. |
| Deflation | General price level falls persistently. | CPI declines over time. |
| Stagflation | Weak/stagnant growth or employment conditions coexist with high inflation. | A supply shock pushes prices up while output falls. |
The attached source highlights stagflation as a particularly difficult situation: a sufficiently large or persistent supply shock can reduce output while raising prices, producing the unusual combination of stagnation and inflation.
What should a student remember?
Inflation is a general and persistent rise in prices, not merely one expensive commodity. Its main mechanisms are demand pressure, rising production costs and inflation expectations. India adds important food, energy, exchange-rate and supply-side dimensions. CPI is the policy anchor, and India's new CPI series uses 2024=100. The current 2026-31 inflation-targeting framework centres on 4% CPI inflation with a 2-6% tolerance band.
Quick revision: the entire topic in one framework
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