US economist Joseph Stiglitz on December 10, 2012 in Barcelona, Spain. Debt problems in both the United States and Europe represent the biggest risks for the global economy in 2013, Nobel prize

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US economist Joseph Stiglitz on December 10, 2012 in Barcelona, Spain. Debt problems in both the United States and Europe represent the biggest risks for the global economy in 2013, Nobel prize laureate Stiglitz wrote in a newspaper article on Wednesday.

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