::Stock market index
A stock index or stock market index is a measurement of the value of a section of the stock market. It is computed from the prices of selected stocks (typically a weighted average). It is a tool used by investors and financial managers to describe the market, and to compare the return on specific investments.
An index is a mathematical construct, so it may not be invested in directly. But many mutual funds and exchange-traded funds attempt to "track" an index (see index fund), and those funds that do not may be judged against those that do.
Stock market index sections
Intro Types of indices Index versions Weighting Criticism of capitalization-weighting Indices and passive investment management Ethical stock market indices Innovations Awards to Stock Indices Lists See also Notes References External links
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