You’ve felt it: the same basket of groceries costs more than it did a few years ago. That’s inflation — and it’s one of the forces central banks and markets watch most closely.
What it is
Inflation is a sustained rise in the general level of prices. Its flip side is that money loses purchasing power — each dollar buys a little less over time. A 3% inflation rate means prices are, on average, 3% higher than a year ago.
It’s measured by tracking the price of a representative basket of goods and services — the best-known gauge being the Consumer Price Index (CPI).
Why a little is good, a lot is bad
Central banks typically target low, stable inflation (often around 2%). A bit of inflation greases the economy — it encourages spending and investing rather than hoarding cash, and gives policymakers room to act.
But problems appear at the extremes:
- High inflation erodes savings, makes planning hard, and can spiral if people expect more of it. Hyperinflation (runaway price rises) can wreck an economy.
- Deflation (falling prices) sounds nice but is dangerous too: people delay spending (why buy today if it’s cheaper tomorrow?), which can choke growth.
What drives it
Inflation rises when demand outstrips supply (too much money chasing too few goods) or when costs jump (e.g. an oil-price spike). Central banks fight it mainly by raising interest rates — the subject of the next lesson.
The takeaway
Inflation is a sustained rise in prices that erodes money’s purchasing power, measured by indexes like CPI. Central banks aim for low and stable inflation; both runaway inflation and deflation are harmful. It’s the variable that most shapes interest-rate policy. (This is education, not investment advice.)