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Author Michael Lewis' claim that the U.S. stock market is rigged was "irresponsible," but the debate it has sparked could lead to positive change, said Bob Greifeld, chief executive of Nasdaq OMX Group, which reported higher earnings on Thursday. "I think certainly it was an irresponsible piece of work and it served to tell a story without any research or factual checking of what was going on and I think it did a disservice to the industry," Greifeld said in an interview. Shortly before "Flash Boys" was released in late March, New York Attorney General Eric Schneiderman said U.S. stock exchanges and alternative trading platforms provide high-frequency traders (HFTs) with unfair technological advantages that give them early access to key data. Last week, Reuters learned that his office had sent subpoenas to at least half-a-dozen HFT firms seeking information on their relationships with exchanges.