The Dow Jones Industrial Index is made up of 30 of the largest, publicly traded companies trading on either the New York Stock Exchange (NYSE) or the Nasdaq. These companies are known as blue-chip stocks to buy for their ability to deliver stable, reliable performance no matter what’s going on in the economy.  These stocks are part of many institutional portfolios. In fact, if you own a mutual fund like the SPDR S&P 500 ETF (NYSEARCA:SPY), you own more than one of these blue-chip stocks. However, when choos ...