A stock market index is a measure of the performance of a group of stocks that represent the market or a sector of the market.

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A stock market index is indeed a measure of the performance of a group of stocks that represent the market or a sector of the market. It is often used as a benchmark to track the overall performance of the stock market or a specific sector. Examples of well-known stock market indices include the Dow Jones Industrial Average, the S&P 500, and the Nasdaq Composite Index.

A Stock Market Index Is a Measure of the Performance