The materials collected in this volume have been selected to illuminate Fisher’s perspectives on the challenges facing economists and economicpolicy makers between 1930 and his death in April 1947. These were years in which there were challenges aplenty. Economic policy-makers had to come to grips with the Great Depression, with economic mobilization for war, and with the design of a post-World War II economic order. Meanwhile members of the economics profession were being obliged to define their position vis-a-vis a doctrinal revolution associated with the name of Britain’s John Maynard Keynes.