Since the publication of Keynes's General Theory of Employment, Interest and Money in 1936, macroeconomic theory has altered considerably. Each author in this volume focuses on an issue which either preceded, accompanied or followed the ''Keynesian Revolution'' and helped to shape economics in subsequent years. Contributors reconsider some of the major concepts of the "General Theory": unemployment and the identity of income and output. They also highlight some of the controversies in macroeconomic theory and review the macroeconomic policy implications and consequences.