 Macroeconomics from the Greek prefix macro, meaning large plus economics is a branch of economics dealing with the performance, structure, behavior, and decision-making of an economy as a whole. This includes regional, national, and global economies. Macroeconomics study aggregated indicators such as GDP, unemployment rates, national income, price indices, and the interrelations among the different sectors of the economy to better understand how the whole economy functions. They also develop model that explain the relationship between such factors as national income, output, consumption, unemployment, inflation, savings, investment, international trade, and international finance. While macroeconomics is a broad field of study, there are two areas of research that are emblematic of the discipline, the attempt to understand the causes and consequences of short-run fluctuations in national income. The business cycle and the attempt to understand the determinants of long-run economic growth increases in national income. Macroeconomic models and their forecasts are used by governments to assist in the development and evaluation of economic policy. Macroeconomics and microeconomics, the pair of terms coined by Ragnar Frisch, are the two most general fields in economics.3. In contrast to macroeconomics, microeconomics is the branch of economics that studies the behavior of individuals and firms in making decisions and the interactions among these individuals and firms it narrowly defined. Markets. Macroeconomics encompasses a variety of concepts and variables, but there are three central topics for macroeconomic research. For macroeconomic theories usually relate the phenomena of output, unemployment, and inflation. Outside of macroeconomic theory, these topics are also important to all economic agents including workers, consumers and producers.