This maneuvering will inevitably cause the choppy, violent movement that is typical of bear raids on the stock market.

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It was supposed to blunt the effects of a massive pile on by traders in a vulnerable stock and prevent predatory bear raids.

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Naked short-selling also intensifies bear raids by making it easier for traders to short stocks, since they do not actually borrow the shares in advance.

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No one has determined if bear raids caused the massive declines in those stocks of if traders were simply reacting to deteriorating fundamentals on Wall Street.

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The SEC will also expand an investigation begun earlier this year into short selling in shares of Bear Stearns and Lehman Brothers, two investment banks that have been forced out of existence (in Bear Stearns case, by way of a rescue by JPMorgan Chase, and in Lehman's, by bankruptcy) in the wake of bear raids on their stocks.

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Traders were accused or orchestrating successful, rumor driven raids on Bear Stearns, AIG and Lehman Brothers as well as taking down the share price of Citigroup and Bank of America.

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