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The course is an intrdocution to macroeconomics, which seeks to understand the what is behind the observed dynamics of several aggregate economic variables: gross domestic product, national income, consumption, aggregate saving, investment, interest rates, money, the capital stock. We will discuss how economists have tried to answer questions such as: What determines economic growth, wealth and long-run welfare? Why modern economic systems are subject to recurrent economic cycles, with recessions and expansions? What determines unemployment and inflation? Which economic policies (monetary or fiscal) should be adopted to increase output and contain unemployment and inflation?