Speaking on a panel at the Institute of International Finance in Washington D.C. on Saturday, Citigroup Inc. Chief Executive Officer Mike Corbat appeared to propose that a hybrid of monetary and fiscal stimulus could be used to buoy U.S. economic activity - a suggestion that bears a striking resemblance to a policy outlined by leader of the U.K. opposition. "The probably more effective mode of QE going forward is going to be some type of infrastructure projects, here in the U.S.," Corbat said in his remarks.