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Dow Jones Industrial Average
A stock market index founded in 1896 by Charles Dow tracking 30 companies in various industries thought to be representative of the American economy. It is a price-weighted index, meaning that stocks with higher prices per share affect the average more. It also scales its averages to account for stock splits and other changes in the companies tracked. All stocks tracked in the DJIA are traded on either the New York Stock Exchange or NASDAQ. It is considered the premier securities index in the United States.