Yahoo is hiring two scientists in the areas of economics and sociology to head up its research in online markets and social networks, the company is expected to announce Thursday. R. Preston McAfee, the J. Stanley Johnson professor of business, economics and management at the California Institute of Technology, will be a vice president and research fellow leading Yahoo's microeconomics research group. McAfee earned a master's degree in economics and mathematics and a doctoral degree in economics from Purdue University and will work out of Yahoo's offices in Burbank, Calif.

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