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6 January 1981: Joe Granville tells everyone to sell everything

Newsletter writer Joe Granville, then the most famous market guru in America, sent subscribers a late-night alert: sell everything. The next day the Dow dropped sharply on what was then record trading volume, as if one man's opinion could move the whole market. It could, for a day. But the great bull market that began in 1982 left his bearish calls looking badly mistimed. Gurus are most dangerous when they are most famous.

The lesson: When one forecaster can move the market, the market is listening to the wrong things.

6 January 1981: Joe Granville tells everyone to sell everything