Ian Bremmer, Eurasia Group's president and founder, discusses his top risks for 2017 and says traditional alliances are crumbling. Lawrence Summers, former U.S. treasury secretary, says the risks to the global economy are enormous. Then, Nouriel Roubini, Roubini Global Economics' co-founder and chairman, says there is a huge amount of uncertainty about economic policy, both in the U.S. and in Europe. Also, Dom Barton, McKinsey & Co.'s global managing partner, says it's technology -- not trade -- that's dislocating jobs. Doug Kass, Seabreeze Partners' founder, says Donald Trump is making volatility great again. Finally, Raghuram Rajan, former governor of the Bank of India, says central banks are in the "process of exit."