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She might not be a household name, but Suzanne Gluck is one of the most powerful people in the book industry. Her slush pile is a key entry point to the biggest publishers in the U.S., and the authors she represents have sold more than 100 million books worldwide. Steve Levitt talks with Gluck — his own agent — about negotiating a deal, advising prospective authors, and convincing him to co-write Freakonomics.