The Simple Definition
Inflation is the rate at which the general level of prices for goods and services rises over time — which means the purchasing power of money falls. In other words, the same amount of money buys less than it did before.
If a basket of groceries cost £50 last year and costs £53 this year, that's roughly 6% inflation on that basket of goods.
How Is Inflation Measured?
Governments and central banks track inflation using price indices — essentially, a standardised "basket" of goods and services that typical households buy. The price of this basket is tracked over time to calculate the inflation rate.
Common measures include:
- Consumer Price Index (CPI): The most widely used measure; tracks the prices of a broad basket of consumer goods and services
- Retail Price Index (RPI): An older UK measure that also includes housing costs like mortgage interest
- Core inflation: CPI excluding volatile categories like food and energy, used to show underlying trends
What Causes Inflation?
Inflation rarely has a single cause. The main drivers fall into a few categories:
Demand-Pull Inflation
When demand for goods and services exceeds supply, prices are pulled upward. This can happen during periods of strong economic growth, high consumer confidence, or when governments inject large amounts of money into the economy.
Cost-Push Inflation
When the cost of producing goods rises — due to higher energy prices, raw material costs, or wage increases — producers pass those costs on to consumers through higher prices.
Monetary Inflation
When the money supply grows faster than economic output, each unit of currency is worth relatively less. This is sometimes summarised as "too much money chasing too few goods."
Expectations
Inflation can become self-reinforcing. If workers expect prices to rise, they demand higher wages. If businesses expect costs to rise, they raise prices preemptively. Managing expectations is a key part of why central banks communicate so carefully.
Is All Inflation Bad?
No — a low, stable rate of inflation is generally considered healthy for an economy. Most central banks target around 2% annual inflation as a sign of a functioning, growing economy. It encourages spending and investment (since holding cash loses value), and it gives central banks room to reduce interest rates during downturns.
Problems arise at the extremes:
- High or hyperinflation erodes savings, reduces living standards, and creates economic instability
- Deflation (falling prices) can be equally damaging — consumers delay purchases expecting cheaper prices later, which slows economic activity
How Does Inflation Affect You?
| Situation | Impact of Inflation |
|---|---|
| Savings in cash | Real value erodes if interest rate is below inflation |
| Fixed-rate mortgage | Repayments become relatively cheaper over time |
| Wage earner | Real wages fall if pay rises don't keep up with inflation |
| Investor in assets | Some assets (property, equities) historically outpace inflation |
| Retiree on fixed income | Purchasing power of pension gradually falls |
How Is Inflation Controlled?
Central banks (such as the Bank of England or the US Federal Reserve) are the primary inflation managers. Their main tool is interest rates:
- Raising interest rates makes borrowing more expensive, reducing spending and cooling inflation
- Lowering interest rates encourages borrowing and spending, which can stimulate a sluggish economy but risks raising inflation
Governments can also influence inflation through fiscal policy — taxation and public spending — though central banks typically act independently.
The Key Takeaway
Inflation is a normal feature of modern economies, not an anomaly. Understanding it helps you make better decisions about saving, investing, and spending — particularly ensuring your money isn't sitting idle losing value when better options exist.