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Thursday's Wall Street Journal tells the story of Xerox and its dreams of the stock market. Xerox punted on a supposed monopoly in plain-paper copying. Then the Japanese competition in copiers arrived, so Xerox tried to diversify into finance and personal computers - couldn't do it. Xerox is a trail of tears. There was a boom in Xerox stock in the early '70s, based on a euphoria, it turns out, that was basically correct.