Economics is divided into two primary, interrelated sub-disciplines: Microeconomics and Macroeconomics. Microeconomics studies how people, businesses, and government agencies use the scarce resources available to them (such as time, money, land, etc.) to achieve their objectives (such as earning income, making a profit, etc.). Macroeconomics is the study of whole economies -- the part of economics concerned with large-scale or general economic factors and how they interact in economies.