Inflation, and what it actually does.
Inflation is the quiet number that every news bulletin mentions and almost no one explains properly. It's not just an abstract figure — it's the slow decay of what your money can buy. Here's how to feel it.
The whole idea, start to finish — then explore the detail and try the sandbox below.
What inflation actually is
Inflation is the rate at which prices, broadly, rise over time. When inflation is 3%, it means that a basket of goods that cost $100 last year typically costs $103 this year. Same goods. Same basket. Different price.
The mirror of that is what people feel: the same money buys less than it used to. That $100 hasn't lost any nominal value — it's still $100. But what it can do in the world has quietly shrunk. That's the part the news doesn't always make tangible.
Why it matters more than you think
People often hear "2.5% inflation" and think "sounds small." Over a single year, it is. Over a working lifetime, it isn't. The maths compounds the same way interest does — small percentages stacked on each other for decades become large totals.
A common shorthand: at 3% inflation, prices double in about 24 years. That means a 30-year-old earning a comfortable salary today should expect, in real terms, to need twice as many dollars to maintain that same comfort by the time they're 54 — just from prices drifting upward.
The widget below lets you feel this. Slide the inflation rate and the time horizon, and watch a starting amount lose its purchasing power in real terms.
The math, in case you want to see it
The formula for purchasing power decay is simple. If you have $X today and inflation runs at r (as a decimal) for n years, the future purchasing power is just $X ÷ (1 + r)ⁿ.
The example to the right works through this for $10,000 today, at 3% inflation, in 25 years. The same dollar amount would only buy what about $4,776 buys today — cash, sitting still, lost more than half its purchasing power without losing a single dollar in nominal terms.
Why central banks target ~2-3%
Most major central banks — the RBA in Australia, the Federal Reserve in the US, the Bank of England — target an inflation rate of around 2-3%. That isn't because 2-3% is harmless. It's because the alternatives are worse.
- Zero or negative inflation (deflation) is dangerous. When people expect prices to fall, they delay spending — why buy today if next year is cheaper? Spending falls, businesses cut hiring, the economy stalls. Japan spent much of the 1990s and 2000s in this trap.
- Very high inflation erodes savings, hurts people on fixed incomes, and makes long-term planning impossible. Argentina, Turkey, and parts of historical Germany have shown what runaway inflation looks like.
- Low and stable — around 2-3% — keeps the economy moving without people losing trust in their currency.
So inflation in this range is tolerated, not desired. It's the least-bad option in the trade-off space.
Who wins and who loses?
The honest summary
Inflation isn't a single villain or hero — it's a force that quietly redistributes wealth between savers and borrowers, between people with assets and people without. The 2-3% you see in the news is small enough to be invisible day-to-day, but large enough to reshape what your money is worth across a decade. The most important thing it does is gently punish cash and reward people who own things.
Understanding inflation doesn't tell you what to do with your money — that depends on a hundred other things. But it does tell you the cost of doing nothing. And "doing nothing" with cash, in a 2-3% inflation environment, isn't really nothing.