Whitney Tilson knows a few things about investing. He has followed Warren Buffett for decades, managed a hedge fund, and written various newsletters and emails for investors, often focused on value investing.

I subscribe to one of his emails, and a point he made in it a few months ago made a big impression on me, as I hadn't thought of it before. He offered an excellent reason why the S&P 500 index keeps winning. That reason can help each of us invest better, too.

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Source Fool.com