The Simple Definition
Inflation is the rate at which the general level of prices for goods and services rises over time — which means each unit of currency buys less than it did before. If a loaf of bread costs £1.00 today and £1.05 next year, that's roughly 5% inflation on that item.
When inflation is discussed in the news, it typically refers to a broad measure across a basket of everyday goods and services — things like food, housing, energy, clothing, and transport.
How Is Inflation Measured?
Most countries use a Consumer Price Index (CPI) to measure inflation. Statistical agencies track the prices of hundreds of goods and services that a typical household might buy. The percentage change in this index over time is reported as the inflation rate.
You may also hear about the Retail Price Index (RPI) or Personal Consumption Expenditures (PCE) — these are alternative measures used in different contexts or countries. They differ mainly in which goods are included and how housing costs are treated.
What Causes Inflation?
Inflation doesn't have a single cause. The main drivers include:
Demand-Pull Inflation
When consumer demand for goods and services exceeds the economy's ability to supply them, prices rise. This often happens during periods of strong economic growth or when significant new money enters the economy (such as large-scale government stimulus).
Cost-Push Inflation
When the cost of producing goods increases — due to rising energy prices, raw material shortages, or supply chain disruptions — businesses pass those costs on to consumers through higher prices. The oil price shocks of the 1970s are a classic example.
Built-In (Wage-Price) Inflation
Workers expect prices to keep rising, so they demand higher wages. Higher wages increase production costs, which push prices higher still — creating a self-reinforcing cycle.
Is All Inflation Bad?
Not necessarily. Most economists consider a low, stable rate of inflation (typically around 2% annually) to be a sign of a healthy, growing economy. It encourages spending and investment rather than hoarding money. The problems arise at extremes:
- High inflation: Erodes purchasing power rapidly, hits people on fixed incomes hardest, and creates economic uncertainty.
- Deflation (negative inflation): Falling prices might sound good, but they can cause consumers to delay purchases (waiting for prices to fall further), leading to economic stagnation.
- Hyperinflation: Extreme, out-of-control inflation that renders a currency nearly worthless — historically seen in cases of war or severe economic mismanagement.
How Does Inflation Affect You Personally?
| Area of Life | Effect of Inflation |
|---|---|
| Savings in cash | Loses real value over time if interest rate is below inflation |
| Wages | Real wages fall if pay rises don't keep pace with inflation |
| Debt (fixed-rate) | Actually benefits debtors — the real value of what you owe decreases |
| Investments | Assets like shares or property can act as a hedge against inflation |
| Grocery shopping | Food and essential goods become more expensive over time |
How Do Governments and Central Banks Respond?
The primary tool used to control inflation is interest rates, set by central banks (such as the Bank of England or the US Federal Reserve). Raising interest rates makes borrowing more expensive, which slows consumer spending and business investment — cooling demand and, in turn, price growth. This is why you often hear about rate decisions in the context of inflation news.
What You Can Do
While you can't control inflation, you can respond to it. Keeping money in accounts with competitive interest rates, investing in assets that historically outpace inflation, reviewing your budget regularly, and avoiding locking into long fixed contracts during high-inflation periods are all practical steps worth considering.
Understanding inflation — what it is, what drives it, and how it affects your money — is one of the most useful foundations of financial literacy.