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Market Manipulation Complaints Are Common But Prosecutions Rare

Traders work on the floor of the New York Stock Exchange in New York, U.S.

Traders work on the floor of the New York Stock Exchange in New York, U.S.

Jin Lee/Bloomberg

CME Group Inc., the operator of the biggest U.S. futures market, has a spoofing problem.

Complaints about the practice -- using fake orders to manipulate prices, then withdrawing them -- are widespread. Enforcement is lax, and prosecutions are rare.