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The Dow Jones Industrial Average (DJIA), S&P 500 and Nasdaq performance over the last 10 years - AMERICAN STOCK RESEARCH
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5 companies now make up 20% of the S&P 500. Here's why Goldman Sachs says that's a bad signal for future market returns. (MSFT, AAPL, AMZN, GOOGL, FB) | Markets Insider
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Why 30 Stocks Are Better Than 100 Or 500: How The Dow Beat The Nasdaq 1999-2019 (NYSEARCA:DIA) | Seeking Alpha
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