Microeconomics studies the choices and interactions of individual consumers, firms, and markets. Macroeconomics studies the economy as a whole, including economic growth, unemployment, inflation, and government stabilization policies.
This distinction is introduced in IB Economics subtopic 1.1 What is economics? and applies to both SL and HL students.
The Difference in Focus
| Area | Microeconomics | Macroeconomics |
|---|---|---|
| Unit of analysis | Individual consumers, firms, workers, and markets | The entire national or global economy |
| Main questions | How are prices and quantities determined? Why do markets fail? | Why does economic activity fluctuate? How can governments achieve macroeconomic objectives? |
| Core variables | Price, quantity, costs, revenue, and consumer and producer surplus | Real GDP, average price level, unemployment, inflation, and economic growth |
| Typical policies | Indirect taxes, subsidies, price controls, and regulation | Fiscal policy, monetary policy, and supply-side policies |
| Main IB diagrams | Demand and supply, externalities, taxes, and subsidies | AD/AS, the business cycle, and the Lorenz curve |
Microeconomics examines how scarcity forces individual economic decision-makers to make choices. For example, it explains how higher production costs shift the supply curve left, increasing the equilibrium price in a particular market.
Macroeconomics combines economic activity across markets. Aggregate demand represents total planned expenditure in an economy and consists of consumption, investment, government spending, and net exports: . A fall in aggregate demand may reduce real output and cause cyclical unemployment across the economy.
A common misconception is that microeconomics means “small problems” and macroeconomics means “large problems.” The correct distinction is the level of analysis, not the importance or physical size of the issue.
Exam Technique
Identify whether the question concerns an individual market or economy-wide outcomes before choosing terminology and diagrams. Micro diagrams use Price and Quantity axes, whereas macroeconomic AD/AS diagrams use Average Price Level and Real Output; confusing these labels can cost diagram marks.