Macro & Central BanksPrice GrowthRising Prices
Inflation
A sustained increase in the general price level, which erodes the purchasing power of a currency over time.
What Inflation means
Inflation is a sustained rise in the general level of prices across an economy, which means each unit of currency buys less than it did before. It is measured with price indices such as the consumer price index or a personal consumption deflator, and reported as a percentage change over a month or a year. Economists distinguish demand-pull inflation, where spending outruns the economy's capacity, from cost-push inflation driven by input costs such as energy or wages, and both can be amplified when the public's inflation expectations become unanchored.
Most major central banks are mandated to keep inflation low and stable, so the inflation data effectively drives the policy rate, and the policy rate drives the currency. The short-run relationship is counterintuitive: higher inflation reduces a currency's real purchasing power, yet it usually strengthens the currency in the near term because it forces higher interest rates. Over long horizons the purchasing power effect dominates and persistently high-inflation currencies depreciate. Traders should also distinguish headline from core measures, since energy swings can mask the underlying trend.
Worked example
If year-on-year inflation surprises at 3.4 percent against a 3.0 percent consensus, short-dated yields typically rise and the currency strengthens on the day, despite the long-run erosion in purchasing power. Illustrative hypothetical.
Related terms
- Consumer Price Index (CPI)A statistical measure of the average change in prices paid by households for a fixed basket of goods and services.
- DeflationA sustained fall in the general price level, which raises the real burden of debt and is difficult for central banks to reverse.
- StagflationThe uncomfortable combination of stagnant or shrinking output and high unemployment alongside persistently high inflation.
- Interest RateThe price of borrowing money, expressed as a percentage per year, with the central bank's policy rate anchoring the whole structure.
- Central BankThe public institution responsible for a currency's monetary policy, issuance and financial stability.
Frequently asked questions
What does Inflation mean in forex trading?
A sustained increase in the general price level, which erodes the purchasing power of a currency over time.
How does Inflation work in practice?
Most major central banks are mandated to keep inflation low and stable, so the inflation data effectively drives the policy rate, and the policy rate drives the currency. The short-run relationship is counterintuitive: higher inflation reduces a currency's real purchasing power, yet it usually strengthens the currency in the near term because it forces higher interest rates. Over long horizons the purchasing power effect dominates and persistently high-inflation currencies depreciate. Traders should also distinguish headline from core measures, since energy swings can mask the underlying trend.
What is an example of Inflation?
If year-on-year inflation surprises at 3.4 percent against a 3.0 percent consensus, short-dated yields typically rise and the currency strengthens on the day, despite the long-run erosion in purchasing power. Illustrative hypothetical.
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