Inflation in plain English
Inflation is a general rise in prices across the economy over time. When inflation is 3%, a basket of things that cost $100 last year costs about $103 today. The flip side: your money's purchasing power falls, because the same $100 buys less.
Inflation is about the overall price level, not one item. Eggs can get cheaper while rent gets more expensive; inflation measures the average across everything people typically buy.
How inflation is measured
Statistics agencies track the prices of a big, representative "basket" of goods and services every month: food, rent, fuel, clothing, healthcare, transport, phone plans and more. The change in that basket's cost over 12 months is the headline inflation rate.
| Country | Main measure | Published by |
|---|---|---|
| United States | Consumer Price Index (CPI); the Fed's preferred gauge is the PCE price index | Bureau of Labor Statistics (CPI); Bureau of Economic Analysis (PCE) |
| India | Consumer Price Index (CPI) | Ministry of Statistics and Programme Implementation |
| United Kingdom | Consumer Prices Index (CPI) | Office for National Statistics |
You will also hear about core inflation, which leaves out food and energy. Those prices jump around with harvests, weather and oil markets, so core inflation gives a clearer view of the underlying trend.
Two more terms: month-over-month compares prices with the month before; year-over-year, the headline number, compares with the same month a year earlier.
What causes inflation
- Demand-pull: people and businesses want to buy more than the economy can produce, so sellers raise prices. This often happens when the economy is booming, or after big stimulus.
- Cost-push: the cost of making things rises (energy, raw materials, shipping, wages) and businesses pass it on. Oil price spikes and supply-chain disruptions are classic examples.
- Expectations: if everyone expects prices to keep rising, workers ask for bigger raises and firms raise prices in advance, which can make inflation self-fulfilling.
- Money and credit: when borrowing is very cheap and money supply grows much faster than the economy, more money chases the same goods.
- Currency weakness: a falling currency makes imports like fuel and electronics more expensive.
Why central banks want about 2%, not zero
The U.S. Federal Reserve and the Bank of England target 2% inflation over time. The Reserve Bank of India targets 4%, within a band of 2% to 6%. Why not aim for zero?
- A little inflation gives a buffer against deflation (falling prices), which can be worse: people delay purchases waiting for lower prices, debts get heavier in real terms, and the economy can stall.
- It gives central banks room to cut interest rates in a downturn.
- It makes it easier for wages and prices to adjust without outright cuts.
When inflation runs well above target, central banks usually raise interest rates to cool spending. When it falls below target and the economy weakens, they cut.
How inflation affects you
Your savings
Money sitting in an account earning less than inflation is quietly shrinking. At 3% inflation, $100 today will buy only about what $74 buys now in 10 years. The useful number is your real return: your interest rate minus inflation. A 4% savings rate with 3% inflation is a real return of about 1%.
Your pay
A 3% raise in a year with 5% inflation is effectively a pay cut. Economists call pay adjusted for inflation real wages.
Your debts
Inflation can help fixed-rate borrowers: you repay the loan with money that is worth less than when you borrowed it. But it usually brings higher interest rates on new and variable-rate debt.
Your investments
High or rising inflation tends to push bond prices down and can weigh on stocks, because it leads to higher interest rates and squeezes company margins. Over long periods, shares of profitable companies have generally outpaced inflation, but not in every period.
A quick rule of thumb: the Rule of 70
Divide 70 by the inflation rate to estimate how many years it takes for prices to double:
- 2% inflation: prices double in about 35 years
- 3% inflation: about 23 years
- 7% inflation: about 10 years
Inflation, disinflation, deflation and stagflation
- Inflation: prices rising.
- Disinflation: prices still rising, but more slowly (inflation falling from 6% to 3%). Prices do not go back down.
- Deflation: prices falling overall.
- Hyperinflation: extremely rapid price rises, often defined as 50% or more a month.
- Stagflation: high inflation combined with weak growth and rising unemployment, a hard mix for central banks because the usual cures pull in opposite directions. It can come with or turn into a recession.
Protecting yourself from inflation
- Keep emergency savings in an account that pays a competitive rate, not 0%.
- For long-term goals, consider investments that have historically beaten inflation over time, such as diversified stock funds, accepting they go up and down.
- Look at inflation-linked bonds (TIPS in the U.S., index-linked gilts in the U.K.).
- Review fixed costs and negotiate raises using the real (inflation-adjusted) numbers.
This guide is general information, not financial advice.
