Michael Lewis’ new book Flash Boys: A Wall Street Revolt has caused a commotion on Wall Street, on Capitol Hill, and with law enforcement agencies. The SEC is the latest government agency to examine and propose new rules on alternative exchanges and high-frequency trading. The SEC’s latest proposals and enforcement actions raise questions about the agency’s plans to effectively regulate and enforce these activities and its ability to do so.

In Flash Boys, Michael Lewis—author of Liar’s Poker, Moneyball, The Blind Side, and The Big Short—follows a “small group of Wall Street investors” who he says “have figured out that the U.S. stock market has been rigged for the benefit of insiders and that, post-financial crisis, the markets have become not more free but less, and more controlled by the Big Wall Street banks.” High frequency trading is a type of trading using sophisticated technological tools and computer algorithms to rapidly trade securities in fractions of a second to profit from the slightest market blips. High frequency trading is done over traditional exchanges. In contrast, dark pools are alternative electronic trading systems conducted outside traditional exchanges that institutional investors use, sometimes to hide their trading intentions or to move the market with large orders.

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