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Opinion: Why the S&P 500's return over the next 10 years will be nothing like the last 10 - MarketWatch
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![Alf on Twitter: "The top 10 companies in the S&P 500 alone represent over 30% of the entire index. Hey look, the S&P 10 is trading well this year! (Chart from Ye Alf on Twitter: "The top 10 companies in the S&P 500 alone represent over 30% of the entire index. Hey look, the S&P 10 is trading well this year! (Chart from Ye](https://pbs.twimg.com/media/FvHfRGkWcAINHQH.jpg:large)