A new study finds that the effect of adding or deleting a stock from the S&P 500 index has disappeared over the past decade.
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Why Stock-Market Investors Can No Longer Count on the 'Index Effect'
![Why Stock-Market Investors Can No Longer Count on the 'Index Effect'](http://www.nasdaqpicks.com/wp-content/uploads/2023/04/Why-Stock-Market-Investors-Can-No-Longer-Count-on-the-039Index-1200x640.jpeg)
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A new study finds that the effect of adding or deleting a stock from the S&P 500 index has disappeared over the past decade.
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