Another September Slump on the Way?

Stocks have shown a tendency to retreat during the month, and S&P has identified a number of potential reasons for the weakness

September has always been a problem for equity investors. It's the only month in which the Standard & Poor's 500-stock index has averaged a decline from 1990 to the present, 1970 to the present, 1945 to the present, and 1929 to the present. In each of these periods, the S&P declined in September more than half the time.

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