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Emil Michael, senior vice president of business for Uber Technologies Inc., stands for a photograph after a Bloomberg Television interview in San Francisco, California, U.S., on Tuesday, July 29, 2014. Michael discussed Uber's targeting of business travelers and surge pricing. Photographer: David Paul Morris/Bloomberg via Getty Images

Emil Michael, senior vice president of business for Uber Technologies Inc., stands for a photograph after a Bloomberg Television interview in San Francisco, California, U.S., on Tuesday, July 29, 2014. Michael discussed Uber's targeting of business travelers and surge pricing. Photographer: David Paul Morris/Bloomberg via Getty Images