The Securities and Exchange Commission is looking at such mechanisms as price collars and limits on upward or downward movements in a stock in a single day, in the wake of the May 6 Flash Crash.

"We are considering whether other steps are appropriate to reduce the risk of sudden disruptions and clearly erroneous trades," SEC Chairman Mary L. Schapiro said at the outset of a meeting of the Joint Advisory Committee of the SEC and the Commodity Futures Trading Commission on the implications of the events in May, when the Dow Jones Industrial Average fell nearly 1,000 points in a seeeming flash and blue-chip U.S. stocks, such as that of Accenture [ACN], fell as low as one cent.

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