Definition of Economics

Economics is the study of how people, businesses, and societies make choices about how to use their limited resources. Because resources are scarce but wants are effectively unlimited, every choice means giving something up — and economics is the science of those trade-offs. It explains how decisions are made and how they fit together into markets and whole economies.

The starting point of economics is scarcity: there is never enough time, money, labor, or raw material to satisfy every want. Scarcity forces choice — individuals, firms, and governments must all decide what to produce, how to produce it, and who gets it. Studying how people make these decisions is the heart of the economic way of thinking.

Every choice carries an opportunity cost: the value of the next-best alternative you gave up. If you spend an hour studying instead of working, the opportunity cost is the wage you did not earn. Thinking in terms of opportunity cost is what separates an economic decision from a simple one, and it applies to how societies allocate goods, services, and factors of production.

Economics splits into two branches. Microeconomics studies the choices of individual households and firms — how prices are set and how markets work. Macroeconomics studies the economy as a whole — growth, unemployment, and inflation. Both rely on evidence, so economists are careful to separate factual claims from value judgments, the distinction between positive and normative statements.

Understanding economics helps you make better personal decisions, follow the news about jobs and prices, and see why policy choices involve trade-offs rather than free lunches.

Related lessons

• Microeconomics