Economics is the study of how societies allocate scarce resources. At its core, it’s about choices — every resource spent on one thing is a resource not spent on another.
The two big branches:
- Macroeconomics — the big picture. GDP, inflation, unemployment, monetary policy, trade. How economies grow, shrink, and cycle.
- microeconomics — the small picture. How individuals and firms make decisions, how markets set prices, supply and demand.
Key ideas that change how you see the world:
- Incentives — people respond to incentives. Get the incentives right and you barely need rules. Get them wrong and no amount of rules will help. This is the most powerful idea in economics.
- Opportunity cost — the true cost of anything is what you give up to get it. Every “yes” is an implicit “no” to something else.
- Supply and demand — prices are information. They signal where resources should flow. When you interfere with prices, you interfere with information.
- Comparative advantage — even if you’re better at everything than someone else, you both benefit from specializing and trading. This is why trade exists and why it makes everyone richer.
- Externalities — costs or benefits that affect parties not involved in a transaction. Pollution is an externality. Your neighbor’s beautiful garden is an externality.
Economics gets political fast because different economic theories lead to different policy conclusions. But underneath the politics, the core insights about human behavior, incentives, and trade-offs are incredibly practical.
Related: game theory, microeconomics, Investing, Asset Classes