This document provides an overview of macroeconomics concepts. It begins with defining economics and its origin from the Greek words oikos and nomus, meaning household management. It then discusses the central problem of scarcity due to limited resources and unlimited wants. Factors of production and the circular flow model showing the flow of resources and payments between households and businesses are introduced. Opportunity cost, basic economic questions around consumption, distribution and growth, and the types of economic systems are also summarized. Finally, it distinguishes between positive and normative economics and microeconomics versus macroeconomics.