The course of Principles of Macroeconomics studies aggregate variables like inflation rate, unemployment rates, economic rate of growth and price level in the context of a national economy. The course is designed to help the student to understand how a national economy works, how the macroeconomic variables interact and how some of them behave in the short run versus the long run. The impact of the variables on the outcomes of a nation’s income will be presented, as well as the way they can be used to implement economic policies.