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A number calculated by weighting a number of prices or rates according to a set of predetermined rules. A financial market index is a statistical construct that measures price changes and/or returns in stock markets, fixed income markets, currencies or futures markets. The purpose of the index calculation is to provide a single number whose behavior is representative of the movements of a variety of prices or rates and indicative of behavior in a market. Indexes serve as underlyings for a number of products, particularly in equity and fixed income markets.
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