The long-term trend is toward more volatility. Judging by the number of times in a year the S&P 500 swung 2 percent or more in a single day, markets are much more likely to have large leaps up or dives down, according to S&P's equity research group. Swings of 2 percent occurred an average of five times a year from 1950 to 1999. It's already happened 20 times this year, with three months left to go.
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Analysts say it's also the chief reason Americans are fleeing the stock market as if it's 2008 all over again. Retail investors pulled $36 billion out of U.S. stock funds in August, according to preliminary data from the Investment Company Institute. That's second only to the $47 billion withdrawn from U.S. stock funds at the height of the financial crisis in October 2008.
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