AP Microeconomics — Question of the Day

About the AP Microeconomics exam

AP Microeconomics examines the decisions of individual economic actors—consumers, firms, and resource owners—and how their interactions determine prices and allocate scarce resources. The course is built around six units: basic economic concepts (scarcity, opportunity cost, comparative advantage, and the production possibilities curve); supply and demand, including elasticity, consumer and producer surplus, and the effects of price controls and taxes; production, cost, and the perfect competition model; imperfect competition (monopoly, oligopoly, monopolistic competition, and game theory); factor markets, where wages and resource prices are determined; and market failure with the role of government, covering externalities, public goods, and equity. Supply and demand and the firm-behavior units carry the most weight, so fluency with cost curves and profit-maximization is essential. Students must determine where marginal revenue equals marginal cost, distinguish short-run from long-run outcomes, and compare market structures on price, output, and efficiency. The most frequent mistakes involve cost-curve relationships—misplacing the marginal cost curve through the minimum of average variable and average total cost—and confusing the demand and marginal revenue curves under monopoly versus perfect competition. Students also lose points by failing to show profit or loss as a shaded rectangle or by misidentifying the shutdown condition (price below average variable cost). Because the free-response section rewards precise, labeled graphs and clearly shown calculations, the best preparation is repeated, timed practice drawing firm and market diagrams from memory, reasoning through elasticity and surplus, and studying official scoring guidelines to see exactly what earns each point. Conceptual understanding of why curves shift beats rote memorization.