Senate Hearing On Structural Reforms At The SEC [Getty Images]

Craig Lewis, director of the division of risk, strategy and financial innovation at the U.S. Securities and Exchange Commission (SEC), testifies at a Senate Banking Committee hearing in Washington, D.C., U.S., on Wednesday, Nov. 16, 2011. SEC investigators need additional tools to adequately police market advances such as high-frequency and algorithmic trading, the agency's enforcement chief told lawmakers today. Photographer: Joshua Roberts/Bloomberg via Getty Images

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