AP Microeconomics — Free Practice Questions, Study Guides & Mock Exams

Learn AP Microeconomics step by step through skill drills, unit practice, and mock exams covering supply and demand, market structures, firm behavior, externalities, and government policy.

Topics covered

• Skill Drill
• Concepts
• Scenario Application
• Word Bank
• Advanced Reasoning
• Advanced Word Bank
• Common Errors
• Graph Interpretation
• Calculation
• Parsons
• Graph/Table Interpretation
• Graph Manipulation
• Topic 1.1: Scarcity
• Topic 1.2: Resource Allocation and Economic Systems

Free AP Microeconomics study guides

• Scarcity — Limited resources meet unlimited wants, so every person and society must choose — and every choice has an opportunity cost.
• Scarcity, Production Possibilities, and Trade — Move from the scarcity constraint to opportunity cost, productive capacity, comparative advantage, specialization, and mutually beneficial exchange.
• Resource Allocation and Economic Systems — Every society answers what, how, and for whom to produce — the economic system decides who does the answering.
• Production Possibilities Curve (PPC) — The PPC maps the maximum output of two goods when resources are fully used — its slope is opportunity cost, its shape is increasing cost.
• Marginal Decisions and Consumer Choice — Use total and marginal comparisons to choose among projects, allocate a budget, and identify the optimal quantity without being distracted by sunk costs.
• Comparative Advantage and Trade — Specialize where your opportunity cost is lowest and trade — both sides can then consume beyond their own production possibilities.
• Demand, Supply, and Elasticity — Build demand and supply correctly, separate movements from shifts, and measure responsiveness with price, income, and cross-price elasticities.
• Equilibrium, Intervention, and Trade — Find market-clearing outcomes, track adjustment and simultaneous shifts, then measure the price, quantity, revenue, and welfare effects of policy and international trade.
• Cost-Benefit Analysis — Rational choices weigh total benefits against total costs — counting opportunity cost, ignoring sunk cost, and maximizing net benefit.
• Marginal Analysis and Consumer Choice — Do more while marginal benefit beats marginal cost, stop at MB = MC — and maximize utility by equalizing marginal utility per dollar.
• Production, Costs, and Profit — Translate productivity into short-run cost behavior, choose plant scale in the long run, and distinguish accounting profit from economic profit.
• Demand — The law of demand slopes the curve down; a change in own price moves along it, while a change in a determinant shifts the whole curve.
• Perfect Competition and Firm Decisions — Use marginal revenue and marginal cost to select output, distinguish loss minimization from shutdown, and trace entry or exit to long-run competitive equilibrium.
• Market Power, Monopoly, and Price Discrimination — Explain the source of market power, solve the single-price monopoly graph, compare it with the efficient benchmark, and analyze price discrimination within the required AP scope.
• Supply — The law of supply slopes the curve up; own-price changes move along it, while determinants like input costs and technology shift the whole curve.
• Monopolistic Competition, Oligopoly, and Game Theory — Trace entry and product differentiation in monopolistic competition, then solve required two-player, two-action strategic games using dominant strategies and Nash equilibrium.
• Price Elasticity of Demand (PED) — Elasticity is the percentage response of quantity to price — above 1 is elastic, below 1 is inelastic, and it sets which way total revenue moves.
• Price Elasticity of Supply (PES) — Supply elasticity is the percentage response of quantity supplied to price — positive, benchmarked at 1, and driven mostly by time to adjust.
• Factor Markets and Monopsony — Derive factor demand from marginal revenue product, analyze wage and employment changes, and contrast wage-taking hiring with monopsony.
• Efficiency and Externalities — Use marginal social benefit and marginal social cost to identify efficient output, diagnose external-cost or external-benefit wedges, and select corrective policy.
• Other Elasticities — Elasticity applies to any determinant: income elasticity sorts normal from inferior goods, and cross-price elasticity sorts substitutes from complements.
• Market Equilibrium and Surplus — Where supply meets demand the market clears — and the gains to buyers and sellers, total surplus, reach their maximum.
• Public Goods and Government Intervention — Classify goods by rivalry and excludability, explain free-rider and open-access problems, and compare how policy operates across market structures.
• Market Disequilibrium and Changes in Equilibrium — Surpluses and shortages push price toward balance; a demand or supply shift then resets the market at a new, predictable equilibrium.
• Income Distribution and Tax Systems — Interpret income, wealth, poverty, Lorenz curves, Gini comparisons, sources of inequality, and progressive, proportional, and regressive tax structures without using excluded calculations.
• Market Intervention — Price controls, taxes, and subsidies bend incentives — and in an efficient market, every one of them shrinks total surplus into deadweight loss.
• International Trade and Public Policy — At the world price, trade fills the gap between domestic supply and demand — raising total surplus, while tariffs and quotas claw part of it back.
• The Production Function — Adding a variable input to fixed inputs raises output — but past a point each unit adds less, the law of diminishing marginal returns.
• Short-Run Production Costs — Diminishing returns push marginal cost up and give the average curves their U-shape — with MC slicing ATC and AVC at their minimums.
• Long-Run Production Costs — In the long run every input varies — the LRAC curve traces economies of scale, then constant returns, then diseconomies of scale.
• Types of Profit — Accounting profit ignores implicit costs; economic profit counts them — and a zero economic profit is a normal profit, not a failure.
• Profit Maximization — Every firm makes the quantity where marginal revenue equals marginal cost — then price versus ATC reveals profit, break-even, or loss.
• The Produce, Shut-Down, and Entry/Exit Decisions — Short run: produce only if price covers average variable cost. Long run: entry and exit compete economic profit down to zero.
• Perfect Competition — Many firms, one identical product, every firm a price taker — and in the long run price is driven to minimum ATC, both efficient.
• Introduction to Imperfect Competition — With market power, a firm faces downward-sloping demand and becomes a price maker — so marginal revenue falls below price.
• Monopoly — A single seller sets quantity at MR = MC but prices up on demand — so price exceeds marginal cost, output is too low, and deadweight loss appears.
• Price Discrimination — Charging each buyer a different price lets a firm with market power capture consumer surplus — and, done perfectly, reach the efficient quantity.
• Monopolistic Competition — Many firms, differentiated products, a sliver of market power each — but free entry drives long-run profit to zero, leaving excess capacity.
• Oligopoly and Game Theory — A few interdependent firms means each move depends on rivals — so we hunt for dominant strategies and the Nash equilibrium in a payoff matrix.
• Introduction to Factor Markets — Firms buy inputs for what they produce, so factor demand is derived — a firm hires each unit whose marginal revenue product covers its cost.
• Changes in Factor Demand and Supply — Factor demand shifts with product price and productivity; factor supply shifts with worker availability — each moving the equilibrium wage and quantity.
• Competitive Factor Markets — A wage-taking firm faces a flat marginal factor cost equal to the wage, and hires where MRP = MFC — so the wage equals the last worker's MRP.
• Monopsony — A single buyer of labor faces marginal factor cost above the wage — so it hires where MFC = MRP and pays a wage below MRP, lower than competition.
• Socially Efficient and Inefficient Outcomes — Efficiency means producing where marginal social benefit equals marginal social cost — market failures push output off that point and destroy surplus.
• Externalities — Costs or benefits that spill onto third parties split private from social curves — negative externalities overproduce, positive ones underproduce.
• Public and Private Goods — Rivalry and excludability sort every good into four types — and the non-rival, non-excludable public good is the one the market under-provides.
• Government Intervention in Market Structures — In imperfect markets, price regulation, natural-monopoly subsidies, and antitrust can raise efficiency — but only when the policy fits the failure.
• Income Inequality and Taxation — The Lorenz curve and Gini coefficient measure inequality — and progressive, proportional, or regressive taxes decide which way it moves.

Units

• Unit 1: Basic Economic Concepts
• Unit 2: Supply and Demand
• Unit 3: Production, Cost, and the Perfect Competition Model
• Unit 4: Imperfect Competition
• Unit 5: Factor Markets
• Unit 6: Market Failure and the Role of Government

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