A price, the price level and the inflation rate
If coffee rises from two to three euros, its price has increased by half. That alone does not mean inflation is fifty percent. Inflation describes a broad set of prices: some rise, some remain unchanged and some fall. A statistical index combines them into one weighted measure so that periods and countries can be compared.
The price level and its rate of change are different. If annual inflation falls from ten to two percent, average prices normally have not returned to their old level; they are merely rising more slowly. A fall in the general price level is deflation. Stable inflation likewise does not mean that every price moves at the same rate.
How the HICP number is constructed
Eurostat and national statistical offices collect prices for a representative basket of goods and services. Categories receive weights according to their shares in household consumption spending. Housing, food, transport and services therefore do not affect the result equally. The basket and weights are updated because purchasing patterns change over time.
The Harmonised Index of Consumer Prices uses common methods so euro-area countries can be compared. Statisticians handle quality changes, seasons, new products and sales. No single number captures every living cost perfectly; owner-occupied housing costs, for example, present methodological limitations and remain the subject of expert debate.
- prices are sampled across many items and locations
- each category is weighted by consumer spending
- comparable quality is tracked over time
- the result is a population average, not one family's statement
Why prices rise
Inflation can have several causes at once. Strong demand may meet limited productive capacity. Oil, gas, transport or a poor harvest can raise input costs that firms partly pass on. A weaker currency can make imports dearer. Wages can affect demand and costs, with productivity determining how much. Taxes and administered prices can move the index directly.
Money and credit matter, but the slogan ‘more money equals the same inflation’ skips money velocity, demand to hold money, output conditions and financial intermediation. If people expect persistent inflation, they may demand higher wages and firms may reprice faster, embedding the shock. Central banks therefore examine causes, breadth and persistence rather than one monthly figure alone.
Personal experience and the Bitcoin alternative
A household spending heavily on energy and food may experience inflation above the average in a particular year. A person buying a home faces a cost represented differently in a consumer index than on their bill. That does not make the official number fictional; it means the index answers a precisely defined average question while a personal budget answers another.
Bitcoin has a predictable issuance path and maximum supply, so no central committee can expand its base units at will. Stable purchasing power does not follow: the BTC price depends on changing demand, liquidity, regulation, technical risk and expectations. Bitcoin addresses uncertainty about supply rules, not automatically the volatility of a consumer basket.