The U.S. consumer agency, which enforces federal antitrust law, and 17 states filed their lawsuit against Amazon in Seattle federal court on Tuesday, asking a U.S. judge to consider an injunction and other penalties to combat alleged unlawful conduct. The FTC's lawsuit is related to but broader than a series of private consumer cases filed in recent years against Amazon that are pending in the same U.S. federal court. The private antitrust cases offer an early window into some of the legal arguments Amazon could be expected to make to challenge the FTC's lawsuit. Generally speaking, U.S. judges are "wary of using antitrust law to punish low-pricing behavior," said antitrust scholar Sean Sullivan of the University of Iowa's law school. Sullivan said it is not always a clear line between "good low pricing" — based on market competition — and "bad low pricing" that helps a company acquire or maintain market power.

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Persons: Mike Segar, David Balto, Diane Hazel, Foley, Lardner, Hazel, Tom Cotter, David Zapolsky, Zapolsky, Lina Khan, Ricardo Martinez, Martinez, George W, Bush, Sean Sullivan, Sullivan, Mike Scarcella, Leigh Jones Organizations: REUTERS, U.S . Federal Trade, Amazon.com, Amazon, Reuters, FTC, U.S, University of Minnesota Law School, District, University of, Thomson Locations: Manhattan, New York City, U.S, Seattle, Washington, Mt, Rainier