TRIPLE WHAMMY: Corporate earnings are getting hit by slowing economic growth at home and abroad. Also, many companies have cut expenses and squeezed workers as much as possible, so profits margins are dropping, too.
HISTORY LESSONS: Stocks have risen after earnings fell before, but only half the time and occasionally not for very long. The S&P 500 rose 10 percent in the three months following a plunge in profits in the third quarter of 2001. But then stocks dropped in each of the next three quarters.
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