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A fierce artificial intelligence-led rally in the U.S. stock market ran out of steam in August, with the S&P 500 index on pace to suffer its worst month in six and the Nasdaq Composite set for biggest monthly decline this year, but expect September, which is just two trading days away, to be even more volatile if the past several decades are any guide.
Since 1945, the large-cap S&P 500 index SPX has delivered an average monthly return of negative 0.73% in September, the worst average performance of any month, said Sam Stovall,…
