When people talk about the stock market, they often refer to the S&P 500. There are thousands of stocks in addition to the 500 companies included in the index, but the S&P does serve as a pretty good proxy for the overall market.

It makes sense, therefore, to pay attention to what the major index is doing. I bring this up because the S&P 500 could be about to do something it hasn't done in over two years. Here's what that something is -- and what it means for investors.

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Source Fool.com