Mary Schapiro, chairman of the Securities and Exchange Commission, said the agency is considering rules for high-frequency traders amid concerns that they may have triggered the May 6 "flash crash." Schapiro said the SEC is looking into whether such traders should be obligated to make trades to preserve liquidity. "Some could argue that May 6 was an aberration -- another perfect storm -- and now that it has passed markets have naturally adapted leaving no need for a comprehensive review of our market structure," Schapiro said. "I disagree."

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