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Nouriel Roubini (left), chairman of the Roubini Global Economics and economic professor at NYU's Stern School of Business, and Ian Bremmer, president of political risk firm Eurasia Group, speak at a Thomson Reuters Newsmaker event in New York on Monday. Bremmer said 'political instability in emerging markets, led by China, will be one of the biggest risks for markets in 2013. Reuters/Keith Bedford