What Is Inflation?
Inflation is the rate at which the general level of prices for goods and services rises over time, eroding the purchasing power of money. When inflation is high, each dollar, pound, or euro buys less than it did before. Central banks monitor it closely because managing inflation is one of their core mandates.
It is typically measured using a Consumer Price Index (CPI) — a basket of commonly purchased goods and services tracked over time. A rising CPI means consumers are paying more for the same things.
What Causes Inflation?
Economists generally identify three primary drivers:
- Demand-pull inflation: When consumer demand for goods outpaces supply, sellers can charge more. This often happens during economic booms when employment is high and people have more money to spend.
- Cost-push inflation: When the cost of producing goods rises — due to higher energy prices, supply chain disruptions, or raw material shortages — businesses pass those costs on to consumers.
- Built-in (wage-price) inflation: When workers expect prices to rise, they demand higher wages. Higher wages increase production costs, which in turn push prices higher — a self-reinforcing cycle.
The Role of Central Banks
Central banks like the US Federal Reserve, the European Central Bank, and the Bank of England use interest rate policy as their primary tool to control inflation. Raising interest rates makes borrowing more expensive, which cools consumer spending and business investment — reducing demand and easing price pressures. Cutting rates does the opposite, stimulating growth but potentially stoking inflation.
Most major central banks target an inflation rate of around 2% per year — seen as healthy enough to discourage hoarding (deflation risk) while not eroding purchasing power too rapidly.
How Inflation Affects Everyday Life
- Savings: If your savings account earns 1% interest but inflation is running at 4%, your money is losing real value each year.
- Mortgages and debt: Fixed-rate borrowers can benefit in inflationary periods — they repay loans with money that is worth less in real terms.
- Wages: Workers whose pay rises slower than inflation see their real wages fall, effectively taking a pay cut.
- Investments: Equities often provide some inflation protection over the long term, while bonds — especially fixed-rate ones — tend to suffer when inflation rises.
Good Inflation vs. Bad Inflation
Not all inflation is harmful. Moderate, stable inflation signals a growing economy. The problem arises when inflation becomes high and unpredictable — businesses struggle to plan, wage negotiations become contentious, and vulnerable households — who spend a higher share of income on essentials — are disproportionately hurt.
Deflation (falling prices) is often considered even more dangerous than inflation. When prices fall, consumers delay purchases expecting further drops, businesses earn less, cut jobs, and a downward spiral can develop — as Japan experienced for much of the 1990s and 2000s.
Key Terms to Know
| Term | Meaning |
|---|---|
| CPI | Consumer Price Index — the main inflation measure |
| Core Inflation | CPI excluding volatile food and energy prices |
| Stagflation | High inflation combined with stagnant economic growth |
| Hyperinflation | Extremely rapid, out-of-control price increases |
| Real vs. Nominal | Real values are adjusted for inflation; nominal are not |