Former U.S. Treasury Secretary Lawrence Summers said investors are far too sanguine about the risks of Donald Trump’s policies, which analysts at Eurasia Group say could contribute to a level of global instability not seen since World War II. The Harvard professor, a Democrat who was Treasury chief under Bill Clinton, on Tuesday cited the possibility of protectionist measures by the U.S. as well as changes to foreign policy and domestic social programs as issues that are creating “extraordinary uncertainty.”