A consumer price index indicates inflation and deflation rates by tracking the cost of consumer goods and services.
The Swiss Federal Statistical Office releases a monthly consumer price index (you can find this here). It also participates in the Harmonized Index of Consumer Prices which compares levels of inflation in countries which participate in either the European Free Trade Association or the European Union.
Consumer price indexes are published in most countries – either by government or non-government statistics offices. These provide valuable information as to the purchasing power of consumers in the corresponding countries, and also indicate trends in supply and demand.