Macroeconomics is the branch of economics that studies the overall economy of a country. According to Wikipedia, macroeconomics is a branch of economics that studies an economy's overall structure, conduct, performance, and decision-making. Let's look at a few topics now that you have a basic understanding of macroeconomics. Macroeconomics is a broad topic as well as a distinct field of study in its own right. National income, GDP, inflation, unemployment, savings, and investments, to name a few fundamental macroeconomic concepts, are all studied.