Soon after his arrival at Harvard in 1937, Hansen's famous graduate seminar on fiscal policy began inspiring graduate students such as Paul Samuelson and James Tobin (both of whom would go on to win the Nobel Prize) to further develop and popularize Keynesian economics. Hansen's 1941 book, Fiscal Policy and Business Cycles, was the first major work in the United States to entirely support Keynes's analysis of the causes of the Great Depression. Hansen used that analysis to argue for Keynesian deficit spending.