In a world where almost every market report mentions the performance of the S&P 500, it might be wise to consider just how well this measure has performed over time and what role it should play in a portfolio. The numbers suggest that despite some spectacular short-term results, too many investors put too much of their money in large-cap stocks.

Investors tend to treat large-cap U.S. stocks as a basic portfolio building block. But large-cap U.S. stocks have not been one of the more stable portfolio ingredients in recent years.

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