This document provides an overview of microeconomics and macroeconomics. It begins by defining microeconomics as dealing with individual economic units like consumers and firms, while macroeconomics analyzes aggregate measures for an entire economy such as gross national product and unemployment levels. Several economists' definitions of macroeconomics are also given emphasizing its focus on overall economic dimensions and goals of full employment and growth. The key differences between micro and macroeconomics are then outlined regarding the nature and objectives of their study as well as subject matter. Finally, some basic microeconomic issues are briefly described such as scarcity and choice, production methods, distribution, efficiency, resource utilization, and economic growth.