This Chart Predicts Trump Will Win, Unless the S&P Rallies in October

Take it with a massive grain of salt, but the stock index hasĀ a funny way of predicting the presidential victor.

Weighing the Risks of a Trump Presidency

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October is the bad boy of the stock market. The Panic of 1907, the Crash of 1929, Black Monday in 1987.

It's notable for another reason, too. The performance of Standard & Poor's 500-stock index from July 31 to Oct. 31 has a curious way of predicting the winner of the presidential election.