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"Efficiency isn't everything for economists, despite the popular image. Come holiday time each year, you'll hear about the scrooges with their models explaining that gift-giving isn't a good idea: People often get things they don't want, and in that case the giver has sucked value out of the world, wasting precious resources. That $50 sweater..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://qz.com/159958/what-many-economists-dont-understand-about-christmas/>