Economics is the study of how individuals, governments, firms, and nations make choices on allocating scarce resources. It can be divided into microeconomics and macroeconomics. Microeconomics analyzes the economic behavior of individual agents like consumers and firms, while macroeconomics looks at aggregates for the whole economy, such as unemployment, GDP, and inflation. Applied economics uses economic theory and techniques to analyze real-world issues, predict outcomes, and inform decision-making. Scarcity necessitates that societies make choices on producing, distributing, and consuming goods and services.