Nobel Prize - Winning Economist And Columbia University Professor Of Economics Joseph Stiglitz Interview [Getty Images]

Joseph Stiglitz, Nobel prize-winning economist and professor of economics at Columbia University, poses for a photograph following a Bloomberg Television interview in London, U.K., on Tuesday, May 19, 2015. Stiglitz said, Greece's giving up the euro would be "really serious" for Europe. Photographer: Simon Dawson/Bloomberg via Getty Images

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