Ben Bernanke, former chairman of the Federal Reserve, speaks during a Radcliffe Day event with Janet Yellen, chair of the U.S. Federal Reserve, not pictured, at Harvard University in Cambridge, Massachusetts, U.S., on Friday, May 27, 2016. Yellen said the ongoing improvement in the U.S. economy would warrant another interest rate increase "in the coming months," stopping short of giving an explicit hint that the central bank would act in June. Photographer: Scott Eisen/Bloomberg via Getty Images
