There's an old joke about a person being asked, "How many people work in your office?" The person responds, "About half of them."

This punchline comes to mind when I look at the S&P 500. Many of the stocks in the index don't perform all that well over time. But as the more-successful stocks outperform, they earn an increased weighting in the S&P 500 because of their larger market caps.

Which stocks in the S&P 500 will work the most for investors throughout this decade? It's impossible to know for sure. However, I'll make a prediction: The following three S&P 500 stocks will at least double in seven years.

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Source Fool.com