Inflation is in the news daily, and most people take it to mean simply that prices went up. The precise meaning matters more, because it explains something that affects you directly: money you save today will not buy in ten years what it buys now.
Inflation is the general rise in prices over time, and its practical meaning is that your money's purchasing power falls. At 3% a year, idle cash loses roughly a quarter of its value in a decade and about half in 23 years.
What is actually measured
Inflation is not the price of one thing. It is a basket of hundreds of goods and services people actually buy: food, rent, transport, healthcare, education, communications. The basket is priced monthly, and the rate it rises by is the inflation figure.
So potatoes getting 30% more expensive is not inflation. Potatoes can rise 30% while phones fall, leaving the general level roughly flat.
This also explains a common experience: that "real" inflation feels higher than the published number. The official basket is an average, and your spending is not average. Someone who spends a third of their income on rent in a fast-rising city lives with higher personal inflation than the national figure. The feeling is right, and so is the number — they are not measuring the same thing.
What it does to your money
Here it becomes concrete. Say you hold 100,000 in an account paying no interest, and inflation runs at 3%.
| After | What it actually buys |
|---|---|
| 1 year | 97,000 |
| 5 years | 86,000 |
| 10 years | 74,000 |
| 20 years | 55,000 |
| 30 years | 41,000 |
The number in your account never changed: still 100,000. What you can buy with it shrank to under half in thirty years.
This is the part that escapes most people. Idle money does not look like it is losing anything, because the figure is constant. The loss happens on the other side of the equation — in the goods it is measured against.
Divide 70 by the inflation rate to find how many years until your money halves in value. At 3%: about 23 years. At 7%: ten.
Nominal and real returns
This distinction changes how you read any savings or investment offer.
- Nominal return is the advertised figure: "this account pays 4% a year."
- Real return is what is left after inflation.
With 3% inflation, a nominal 4% is 1% real. With 5% inflation, that same account means you are losing 1% a year while your balance grows.
The rule: no return figure means anything until you know the inflation it sits against. An 8% return in a country with 12% inflation is worse than 3% where inflation is 1%.
Where inflation comes from
Three main sources, usually working together:
Demand outrunning supply. When spending grows faster than the economy can produce, prices rise. This is what follows stimulus or a sudden reopening.
Rising costs. When energy, raw materials or transport get more expensive, the increase passes through to the consumer. This is why almost every price is sensitive to the oil price.
Expectations. If everyone expects prices to rise, sellers raise prices pre-emptively and workers ask for higher wages — and the expectation fulfils itself. This is why central banks care about anchoring expectations as much as about the numbers.
Why zero is not the target
Zero inflation sounds ideal. It is not, and the reason is that the opposite side is worse.
Deflation — a general fall in prices — makes people delay purchases waiting for a lower price. Demand falls, profits fall, jobs go, demand falls further. It is a loop that is hard to escape.
So most central banks target low positive inflation, around 2%: a safety margin that keeps the economy away from deflation without eating savings quickly.
What to do with this
Three conclusions follow directly from the arithmetic above:
- Idle cash has a cost. Holding large sums in cash for years is not a neutral decision; it is a silent loss at the rate of inflation.
- Read every return after inflation. The nominal figure alone will not tell you whether you are gaining or losing.
- Fixed-rate debt erodes with inflation. If you are repaying a fixed-rate loan, inflation reduces the real burden of your future payments — one of the few effects that works in a borrower's favour.
The exception worth flagging: your emergency fund. That money must stay liquid and immediately available, even if inflation takes a slice. Its purpose is not growth — it is not having to borrow at a high rate when something unexpected happens.
This is an explanation of an economic mechanism, not financial advice, and it does not know your situation — see our disclaimer.
Frequently asked questions
What is the difference between inflation and a price rise?
One item getting more expensive is not inflation. Inflation is a rise in the general price level across a broad basket of goods and services, usually measured by a consumer price index.
Is inflation always bad?
No. Low, stable inflation of around 2 percent is what most central banks target, because it encourages spending and investment. The danger is high or volatile inflation — and deflation, which is worse.
How do I protect savings from inflation?
Cash sitting still loses value by the inflation rate every year. Protection comes from holding assets that return more than inflation, but every asset carries its own risk. That is a question for a qualified adviser.
Why does inflation feel higher than the official figure?
The official index measures an average basket. If your spending is concentrated in things that rose faster than average — rent or food — your personal inflation is genuinely higher than the headline. The feeling is correct and so is the number; they measure different things.
What does the interest rate have to do with it?
Central banks raise rates to slow inflation, because making borrowing more expensive reduces spending and demand. They cut rates to stimulate the economy when inflation is low.
Sources
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