Macroeconomics is the study of the overall economy of a nation. Contrast this to microeconomics which studies a specific industry or market. Macroeconomics is often discussed more in regards to public policy such as what the tax rates should be and how much the government should spend/borrow. The main goals in macroeconomics are stable prices and long-term economic growth. The first is done by a central bank which controls the money supply. The second is done by simply letting individuals and firms interact with each other and create value for each other.