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How do I factor dividends and yield into the performance of a security?
Good observation. In fact, the S&P index itself is guilty of not including dividends. So when you look at the index alone, the delta between any two points in time diverges, and the 20 return observed if one fails to include dividends is meaningless, in my my humble opinion. Yahoo finance will let you look at a stock ticker and offer you an "adjusted close" to include the dividend effect.