Designed for the undergraduate students of economics, commerce and management, this textbook thoroughly explains the principles of macroeconomics. It provides insights into the important macroeconomic issues, such as determination of output, employment, interest rates and inflation. This textbook discusses Classical and Keynesian theories of macroeconomics as well as aptly incorporates Post-Keynesian developments in various aspects of macroeconomics. Further it discusses, at appropriate places, the relevance and applicability of various macroeconomic theories for the developing countries. This textbook also explains and critically evaluates the post-Keynesian theories of consumption function namely, Kuznet's consumption function, Modigliani's life cycle hypothesis and much more.