After 18 March 2015, Apple will officially replace AT&T on the Dow Jones Industrial Average. While it’s a prestigious position for Apple, the Dow is an inferior stock index, since it includes only 30 companies and is a price-weighted average, thus giving higher-priced stocks more influence than their lower-priced counterparts, while ignoring relative industry size and market capitalization. follow link
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Apple to Replace AT&T in the Dow Jones Industrial Average