... Yahoo! CEO Carol Bartz owns a sweatshirt emblazoned with Preston McAfee\'s math. McAfee is an economist, but he\'s the sort of economist who\'s actually useful. In the early-90s, he helped build the simultaneous ascending auction, a mathematical contraption that governments across the globe have since used to license over $100 million in wireless spectrum. And nowadays, as the man who oversees the microeconomics and social sciences research group at Yahoo!, he builds things that are so useful, they wind up on the boss\'s chest. ... [
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