Index (economics)

This article is about index in an economics and finance sense. For other uses, see Index. In economics and finance, an index is a single number calculated from an array of prices or of quantities. Examples are a price index, a quantity index (such as real GDP), a market performance Index (such as a labour market index / job Index or a stock market index). Values of the index in successive periods (days, years, etc.) summarize level of the activity over time or across economic units (regions, countries, etc.).
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