Economy · General financial education

Price index and basket

A price index measures how a basket of typical spending changes in price, not exactly what you bought this week.

In more detail

Destatis (CPI) and Eurostat (HICP) weight types of goods by spending shares. Housing counts more than a single grocery item. A base year often sets the index to 100; later readings are relations to that starting point.

Background

Weights come from household surveys and, in national CPI series, often stay fixed for several years so that pure price change remains visible. A base-year change rescales the series; it does not automatically match what you feel. Your mix can differ from the average basket. That is methodology, not a „false“ index.

An example

If only food rises sharply while housing has a large weight in the basket, your shopping bag can feel different from the published annual rate. Both can be arithmetically right.

A common misconception

The official rate is exactly my inflation.

An index is a weighted basket plus a base year. Your spending shares can differ.

Source: Destatis · Verbraucherpreisindex. Version 0.2.0. Finmon explains. It does not advise. Not investment, tax or legal advice.