Source: www.howstuffworks.com
Dow Jones Industrial Average, and other averages like the S&P 500 or The Russell 2000 are broad market averages designed to tell you how companies traded on the stock market are doing in general. For example, the Dow Jones Industrial Average is simply the average value of 30 large, industrial stocks. Big companies like General Motors, Goodyear, IBM and Exxon are the companies that make up this index. The S&P 500 is the average value of 500 large companies. The Russel 2000 index averages the values of 2,000 smaller companies.
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