So how did the stock market do today? Although a seemingly simple question, most people refer to a  stock market index to answer that question. Today, the Dow Jones Industrial Average (
DJIA), one of the oldest stock market indices in the U.S., 
announced that it would change its components.  As of next Friday, Alcoa, Hewlett-Packard, and Bank of America will be dropped from the DJIA and Nike, Visa, and Goldman Sachs will be added to the index.