Macroeconomics studies the behaviour of the entire economy. It determines out put , inflation, unemployment , balance of payment in the economy. In an economy where individuals won factors of production and use them to produce output, macroeconomics mostly is used there. This book covers eleven chapters. Special focus was given on Keynesian models, Mundell- Fleming model, Phillips curve, Consumption and Investment. This book covers five case studies entirely based on macroeconomic theories. These case studies would be helpful for junior researchers. For the direct benefit of the students some multiple choice type questions are given in this book. Overall this entire book is nothing but the simplification of some macroeconomic thoughts that had been presented in some macroeconomics books.