What is deflation?
Deflation is a general and sustained fall in the prices of goods and services across an economy. When it happens, the same amount of money buys more over time.
The word means more than a single cheaper product. A fall in fuel or phone prices on its own is a relative price change. Deflation means the overall price level is falling, usually measured by a consumer price index (CPI), which tracks the cost of a fixed basket of everyday goods and services.
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A worked example
This case is hypothetical. A household buys the same monthly basket every month: flour, rice, cooking oil, electricity, transport and rent. Last year the total bill was a certain amount. This year the same basket costs less, and the CPI shows that most items in the basket, not just one or two, have become cheaper.
That is deflation. The rupee in the household's pocket now buys more. If you want to see how a changing price level affects the value of money over time, the calculators page and the guide to future and present value show the method.
Deflation vs inflation
| Term | What prices do | Effect on money |
|---|---|---|
| Inflation | General price level rises | Money buys less |
| Disinflation | Prices still rise, but more slowly | Money still loses value, more slowly |
| Deflation | General price level falls | Money buys more |
People often confuse disinflation with deflation. If a news report says inflation is "falling", prices are usually still rising, just at a slower rate. That is disinflation, not deflation.
Formal definition and edge cases
Economists define deflation as a negative rate of change in a broad price index over a sustained period. In practice:
- Headline vs core. Headline CPI can turn negative because of food or energy alone. Core measures that exclude those items may still be rising. Analysts check both before calling it deflation.
- Good vs bad deflation. Prices can fall because productivity improves. They can also fall because demand collapses, as during a credit crunch. The second kind is the one central banks worry about.
- Debt burden. Falling prices and incomes make fixed debts heavier in real terms. This links deflation to default risk and to the debt-to-GDP ratio.
- Deflationary spiral. If people delay spending because they expect lower prices, demand falls further. This feeds back into the business cycle.
- Policy limits. Central banks usually respond by cutting policy rates. When rates are already very low, there is little room left to cut, so other tools come into play.
Where you see the term
- Economic calendars and CPI releases. These are monthly figures with a "previous", "forecast" and "actual" column. A negative actual reading signals falling prices.
- Central bank statements. Monetary policy statements discuss price risks in both directions.
- Market news. Deflation fears are often linked to bear markets, flight to quality and currency appreciation.
Price data can move currencies, gold and stock indices sharply. Leveraged CFD and forex trading around such releases can lose money fast. For how traders read this data, see fundamental analysis.
Related terms
Frequent questions
What is deflation in simple words?
It is a general fall in prices across the economy, so money buys more than before.
Is deflation good or bad?
It depends on the cause. Falling prices from higher productivity can be harmless. Falling prices from weak demand and rising debt burdens can deepen a slowdown.
What is the difference between deflation and disinflation?
Under deflation, prices fall. Under disinflation, prices still rise, but more slowly than before.
How is deflation measured?
It is usually measured with a broad price index such as CPI. Analysts compare headline and core readings over several periods.
Why do central banks fear deflation?
It can lead people to delay spending, raise the real value of debts, and limit how far interest rates can be cut.