As the Commodity Futures Trading Commission prepared to hear public comments Thursday on concerns that high-frequency trading is distorting markets, the chairman of the largest U.S. futures exchange said industry oversight adequately protects investors. "They are going to have to come up with some procedures or policies that show these guys are doing x,y,z that we think is manipulating the market," CME Group chairman Terry Duffy told Reuters. "I would absolutely agree with that, but we're not seeing that. And if anybody is trying to do anything nefarious, we are policing it." Duffy contended that the CFTC has not yet identified an issue that needs to be addressed. "You have to have a reason why you're doing it other than, 'We think that they are making things go up and down in a fast way but we don't why or how,'" Duffy said. High-frequency trading now accounts for more than 60 percent of all futures trades on U.S. exchanges like CME and IntercontinentalExchange,
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