This free AP Microeconomics study guide teaches to the College Board exam — every one of the six official units, organized the way the course is built.[1] Microeconomics is the study of how individual decision-makers — consumers, firms, and specific markets — allocate resources, and how prices coordinate those choices.[2]
The guide covers the current course: Basic Economic Concepts, Supply and Demand, Production and Costs with Perfect Competition, Imperfect Competition, Factor Markets, and Market Failure. It’s interactive, not a wall of text: every unit has a built-in checkpoint quiz, hover-able glossary terms, labeled graphs, worked examples, and concept questions, so you learn by doing.
Taking both AP economics exams? Everything here pairs with our AP Macroeconomics practice test — they share the same supply-and-demand foundation. Read this guide unit by unit, test yourself at each checkpoint, then round out your free prep with our practice questions and flashcards.
AP Microeconomics is one of the 17 AP exams — explore our AP study guides to compare and prep across the whole family.
AP Microeconomics Exam Snapshot
| Detail | AP Microeconomics |
|---|---|
| Sections | Two: 60 multiple-choice + 3 free-response questions |
| Multiple choice | 60 questions · 1 hr 10 min · 66.7% of the score |
| Free response | 3 questions (1 long + 2 short) · 1 hr (incl. 10-min reading) · 33.3% |
| Total time | About 2 hours 10 minutes |
| Units | 6 College Board units (Basic Concepts → Market Failure) |
| Score scale | 1–5; a 3 or higher is generally considered passing |
| Calculator | Not permitted on either section |
| Graphs | Drawing and labeling graphs is required on the FRQ section |
| Publisher | College Board |
Roughly 2 hours 10 minutes total. Section II rewards clean, fully labeled graphs — the single biggest source of easy points students leave on the table.
- Section I — Multiple Choice60 questions · 1 hour 10 minutes · 66.7% of the exam score. Tests concepts, graph reading, and calculations across all six units.
- Section II — Free Response3 questions · 1 hour (10-min reading period included) · 33.3% of the score. One long FRQ plus two short FRQs; you draw and label graphs and explain reasoning.
Final scores are reported 1–5; a 3 or higher is generally considered passing and may earn college credit.
Because the free-response section is a full third of the score and rewards clean, fully labeled graphs, graphing is one of the highest-yield skills you can build.[3] Spend your study time across all six units, but know that Units 2 and 3 together are roughly half the exam:
Units 2 and 3 together are roughly half the exam — master supply, demand, costs, and perfect competition first.
College Board reports unit weights as approximate ranges, so the exact mix shifts slightly each year.[1] This guide teaches all six units in the official order, each as a study module with a checkpoint quiz.
Unit 1 · Basic Economic Concepts
12–15% of the exam. The foundation: why choices exist at all. Scarcity forces trade-offs, every trade-off has an , and rational decision-makers weigh marginal benefit against marginal cost.[1]
Scarcity & Opportunity Cost
— limited resources against unlimited wants — is the reason economics exists. Every choice means giving something up, and the value of that next-best alternative is its . Economists think at the margin: do an activity as long as its marginal benefit is at least its marginal cost.
The Production Possibilities Curve
The shows the most of two goods an economy can make. Points on the curve are efficient, inside are inefficient, and outside are unattainable with current resources. The curve bows outward because opportunity cost increases.
The frontier bows outward because resources aren’t equally suited to both goods — so producing more of one means giving up increasing amounts of the other (increasing opportunity cost).
Comparative Advantage & Trade
is producing more with the same resources; is producing at a lower opportunity cost. The producer with the comparative advantage should specialize, and trade then makes both parties better off.
Checkpoint · Unit 1 · Basic Economic Concepts
Question 1 of 10
Which of the following pairs most accurately captures the two assumptions economists make about resources and wants that together create the central economic problem?
Unit 2 · Supply and Demand
20–25% of the exam — the model you’ll use everywhere. How prices are set, why curves shift, how responsive buyers and sellers are, and what taxes and price controls do to a market.[1]
Demand & Supply
The makes the demand curve slope down; the makes the supply curve slope up. A change in the good’s own price is a movement along the curve; a change in any other determinant shifts the whole curve.
| Shifts DEMAND | Shifts SUPPLY |
|---|---|
| Income (normal vs. inferior goods) | Input/resource prices |
| Prices of substitutes & complements | Technology & productivity |
| Tastes and preferences | Prices of related goods produced |
| Expectations of future price | Expectations & number of sellers |
| Number of buyers | Taxes & subsidies on producers |
Equilibrium & Disequilibrium
is where supply meets demand and the market clears. Above it there is a surplus (quantity supplied exceeds quantity demanded), which pushes price down; below it a shortage pushes price up.
Equilibrium is where supply meets demand: the price P* clears the market so quantity demanded equals quantity supplied (Q*). A shift in either curve moves both the equilibrium price and quantity.
Elasticity
is the % change in quantity demanded ÷ the % change in price. Demand is elastic when that value (in absolute terms) is above 1, inelastic below 1, and unit elastic at exactly 1.
| Measure | What it tells you |
|---|---|
| Price elasticity of demand | Responsiveness of quantity demanded to price; > 1 elastic, < 1 inelastic |
| Determinants of elasticity | Substitutes available, necessity vs. luxury, share of income, time horizon |
| Cross-price elasticity | Positive = substitutes; negative = complements |
| Income elasticity | Positive = normal good; negative = inferior good |
| Price elasticity of supply | Responsiveness of quantity supplied to price; higher with more time |
Surplus, Taxes & Price Controls
and add up to total surplus, which is largest at the free-market equilibrium. A binding price ceiling (below equilibrium) creates a shortage; a binding price floor (above equilibrium) creates a surplus; both create .
Checkpoint · Unit 2 · Supply and Demand
Question 1 of 10
The law of demand states which of the following relationships, holding all else constant?
Unit 3 · Production, Cost & Perfect Competition
22–25% of the exam — the single biggest unit. How firms turn inputs into output, how their costs behave, and how a perfectly competitive firm chooses output to maximize profit.[1]
Production & Diminishing Returns
In the short run at least one input is fixed. As a firm adds a variable input, output rises but eventually by smaller and smaller amounts — the . That declining marginal product is exactly why marginal cost eventually rises.
Short-Run & Long-Run Costs
Know the cost family cold: (MC), (ATC), and (AVC). MC passes through the minimum of both ATC and AVC.
Marginal cost (MC) crosses average variable cost (AVC) and average total cost (ATC) at each curve’s lowest point. When MC is below an average, that average falls; when MC is above it, the average rises.
| Cost | Formula |
|---|---|
| Total cost | TC = TFC + TVC (fixed + variable) |
| Average total cost | ATC = TC ÷ Q |
| Average variable cost | AVC = TVC ÷ Q |
| Average fixed cost | AFC = TFC ÷ Q (falls as Q rises) |
| Marginal cost | MC = change in TC ÷ change in Q |
Profit Maximization (MR = MC)
Every firm in every market maximizes profit by producing where equals — . The difference between markets is only the demand curve the firm faces.
The Perfect Competition Model
In , many firms sell identical products with free entry, so each is a facing a horizontal demand curve where price = MR. The firm produces where P = MC. A firm shuts down in the short run if price falls below its (minimum AVC), and free entry and exit drive long-run economic profit to zero.
Checkpoint · Unit 3 · Production, Cost & Perfect Competition
Question 1 of 10
The law of diminishing returns states that, in the short run, as more units of a variable input are added to a fixed input, what eventually happens?
Unit 4 · Imperfect Competition
15–22% of the exam. What changes when firms have market power: monopoly, monopolistic competition, and oligopoly all face a downward-sloping demand curve, so marginal revenue falls below price.[1]
Every firm produces where MR = MC. The difference is the demand curve it faces: flat (perfectly elastic) for a price taker, downward-sloping for every firm with market power.
Monopoly
A is a single seller behind high barriers to entry. As a it produces where MR = MC, then charges the higher price on its demand curve — restricting output and pricing above marginal cost, which causes deadweight loss. lets it capture more surplus by charging different buyers different prices.
Monopolistic Competition
has many firms selling differentiated products with free entry. Each firm has a little pricing power, but entry drives long-run economic profit to zero — and the firm ends up with excess capacity, producing where price exceeds marginal cost.
Oligopoly & Game Theory
An is a few interdependent firms, so each decision depends on rivals’ likely responses. models this; the is the outcome where no firm can do better by switching strategy alone.
Checkpoint · Unit 4 · Imperfect Competition
Question 1 of 10
A monopoly is best defined as a market structure characterized by which of the following?
Unit 5 · Factor Markets
10–13% of the exam. The mirror image of product markets: here firms are buyers of inputs (labor, land, capital) and households are sellers. Demand for inputs is from demand for the product.[1]
Derived Demand & MRP
A firm’s demand for a factor is its (MRP = marginal product × marginal revenue). It hires more of an input as long as MRP is at least the (MRC), stopping where MRP = MRC.
Firms don’t want workers or machines for their own sake — they want them to produce a salable product. That makes factor demand derived demand.
- Demand for the product risesConsumers want more of the good the firm sells, so its price and output rise.
- Firm needs more inputsTo make more output, the firm hires more of the factor (labor, land, capital) that produces it.
- Marginal Revenue Product risesMRP = marginal product × marginal revenue. A more productive or more valuable worker has a higher MRP.
- Hire while MRP ≥ MRCThe firm hires each additional unit of a factor up to the point where MRP equals marginal resource cost (MRC).
The profit-maximizing hiring rule mirrors the output rule: produce where MR = MC, hire where MRP = MRC.
Labor Markets & Monopsony
In a competitive labor market the wage is set where market labor supply meets demand, and each firm hires where MRP = wage. A — a single buyer of labor — instead hires fewer workers and pays a lower wage than a competitive market would.
Checkpoint · Unit 5 · Factor Markets
Question 1 of 10
A factor market is best described as a market in which which of the following is bought and sold?
Unit 6 · Market Failure & the Role of Government
8–13% of the exam.When free markets don’t reach the efficient outcome on their own — externalities, public goods, and inequality — and how government can correct or worsen things.[1]
Externalities
A (like pollution) imposes costs on third parties, so the market overproduces; a per-unit tax can correct it. A (like vaccination) confers uncaptured benefits, so the market underproduces; a subsidy can correct it.
Public Goods & the Commons
A is non-excludable and non-rival, like national defense. The means private markets underprovide it, so government typically supplies it. A common resource (non-excludable but rival) is over-used — the “tragedy of the commons.”
Government Intervention & Inequality
Government corrects market failure with taxes, subsidies, and regulation, and addresses income inequality with progressive taxes and transfers. The Lorenz curve and Gini coefficient measure how unequally income is distributed.
| Market failure | Government fix |
|---|---|
| Negative externality (overproduction) | Per-unit tax equal to the external cost |
| Positive externality (underproduction) | Per-unit subsidy equal to the external benefit |
| Public good (underprovision) | Government provision funded by taxes |
| Monopoly (restricted output) | Antitrust law or price regulation |
| Income inequality | Progressive taxes and transfer payments |
Checkpoint · Unit 6 · Market Failure & Government
Question 1 of 10
In economics, the term market failure refers to which of the following situations?
How to Use This Study Guide
A study guide is a map, not the whole territory — use it alongside official College Board materials and our free tools. Because the AP exam rewards graphing so heavily, the most valuable habit is re-drawing each key diagram (supply and demand, cost curves, each market structure, factor markets) from memory until the labels are automatic. Lead with the highest-weighted units — 2 and 3 — then fill in the rest.
- 1
Read a unit here
Work through one unit at a time, in the official order — Basic Concepts through Market Failure.
- 2
Take the checkpoint
The quick check at the end of each unit exposes what didn't stick.
- 3
Draw the graphs
Re-create each unit's key diagrams from memory — fully labeled axes, curves, and equilibrium points.
- 4
Drill & take full practice
Send weak units into the free practice questions and flashcards, then sit full timed practice and review every miss.
AP Microeconomics Concept Questions
Core AP Microeconomics ideas the test actually measures — at least one per official unit. Tap any card for a short, exam-ready answer backed by an official source (College Board), then test yourself on them as flashcards.
AP Microeconomics Glossary
Quick definitions for the terms you’ll see most across the six AP Microeconomics units:
- Absolute advantage
- The ability to produce more of a good than another producer using the same resources. It does not, by itself, determine who should specialize — comparative advantage does.
- Average total cost
- Total cost divided by quantity (ATC = TC ÷ Q). Its U-shape comes from spreading fixed costs then rising marginal costs.
- Average variable cost
- Variable cost divided by quantity. A firm shuts down in the short run when price falls below the minimum of its AVC.
- Comparative advantage
- The ability to produce a good at a lower opportunity cost than another producer. Specializing in your comparative advantage and trading benefits both parties.
- Consumer surplus
- The difference between what consumers are willing to pay for a good and the price they actually pay; the area below the demand curve and above the price.
- Deadweight loss
- The loss of total surplus when a market is not at its efficient equilibrium — for example, from a tax, price control, monopoly, or externality.
- Derived demand
- Demand for a factor of production (labor, land, capital) that comes from demand for the product it helps make, rather than for the factor itself.
- Diminishing marginal returns
- As more of a variable input is added to fixed inputs, the extra output from each added unit eventually falls — the reason marginal cost eventually rises.
- Equilibrium
- The price and quantity at which the quantity demanded equals the quantity supplied, so the market clears and there is no shortage or surplus.
- Free-rider problem
- When people can enjoy a good without paying for it, so they understate their willingness to pay and the market underprovides the good.
- Game theory
- The study of strategic decision-making among interdependent players. The prisoner's dilemma shows why oligopolists may fail to cooperate even when cooperation pays.
- Law of demand
- All else equal, as the price of a good rises the quantity demanded falls, and as price falls quantity demanded rises — the reason the demand curve slopes downward.
- Law of supply
- All else equal, as the price of a good rises the quantity supplied rises, and as price falls quantity supplied falls — the reason the supply curve slopes upward.
- Marginal cost
- The additional cost of producing one more unit of output. Rising marginal cost from diminishing returns gives the cost curves their shape.
- Marginal resource cost
- The additional cost of hiring one more unit of a resource. A firm hires up to the point where MRP equals MRC.
- Marginal revenue
- The additional revenue from selling one more unit. For a perfectly competitive firm it equals the market price; for a firm with market power it is below price.
- Marginal revenue product
- The extra revenue from employing one more unit of a resource: marginal product × marginal revenue. It is a firm's demand curve for that input.
- Monopolistic competition
- A market with many firms selling differentiated products and free entry; firms have some pricing power but earn zero economic profit in the long run.
- Monopoly
- A market with a single seller of a product with no close substitutes and high barriers to entry. It restricts output and charges a price above marginal cost.
- Monopsony
- A market with a single buyer of a resource (often labor). A monopsonist hires fewer units and pays a lower price than a competitive market would.
- Nash equilibrium
- A set of strategies in which no player can do better by changing strategy alone, given what the others are doing.
- Negative externality
- A cost imposed on third parties not part of a transaction, like pollution. It causes overproduction and is corrected with a per-unit (Pigouvian) tax.
- Oligopoly
- A market dominated by a few interdependent firms, where each firm's decisions depend on rivals' likely responses — often analyzed with game theory.
- Opportunity cost
- The value of the next-best alternative given up when a choice is made. The true cost of any decision is what you sacrifice to get it.
- Perfect competition
- A market with many small firms selling identical products, free entry and exit, and perfect information, so each firm is a price taker that earns zero economic profit in the long run.
- Positive externality
- A benefit enjoyed by third parties not part of a transaction, like vaccination. It causes underproduction and is corrected with a subsidy.
- Price discrimination
- Charging different buyers different prices for the same good based on willingness to pay. It requires market power, separable customers, and no resale.
- Price elasticity of demand
- A measure of how responsive quantity demanded is to a price change: % change in quantity demanded ÷ % change in price. Above 1 (absolute value) is elastic, below 1 is inelastic.
- Price maker
- A firm with market power that can set its price by choosing its output along a downward-sloping demand curve, like a monopoly.
- Price taker
- A firm that must accept the market price because its output is too small to affect it; its demand curve is horizontal (perfectly elastic).
- Producer surplus
- The difference between the price producers receive and the minimum they would accept; the area above the supply curve and below the price.
- Production possibilities curve
- A graph showing the maximum combinations of two goods an economy can produce with its resources fully and efficiently employed. Points on it are efficient, inside are inefficient, outside are unattainable.
- Profit maximization
- Producing the quantity where marginal revenue equals marginal cost (MR = MC). Beyond that point the next unit costs more than it earns.
- Public good
- A good that is non-excludable and non-rival, like national defense. The free-rider problem leads private markets to underprovide it.
- Scarcity
- The basic economic problem: resources are limited while human wants are unlimited, so every society must make choices about how to use what it has.
- Shutdown point
- The output and price (minimum of average variable cost) below which a firm stops producing in the short run because it cannot cover its variable costs.
Free AP Microeconomics Study Materials & Resources
Everything you need to prepare for AP Microeconomics is free here — no paywall, no sign-up. This guide is the foundation; pair it with the rest of our free AP Microeconomics study materials for active recall, timed practice, and last-minute review:
- AP Microeconomics Practice Test — exam-style questions across all six units, with explanations.
- AP Microeconomics Flashcards — active-recall decks for the high-yield concepts, curves, and market structures.
- AP Macroeconomics Practice Test — the companion exam on the same supply-and-demand foundation.
AP Microeconomics Study Guide FAQ
The AP Microeconomics exam has two sections and runs about 2 hours 10 minutes. Section I is 60 multiple-choice questions (1 hour 10 minutes, 66.7% of the score). Section II is 3 free-response questions — one long and two short (1 hour including a 10-minute reading period, 33.3% of the score).
Six College Board units: Unit 1 Basic Economic Concepts (12–15%), Unit 2 Supply and Demand (20–25%), Unit 3 Production, Cost, and the Perfect Competition Model (22–25%), Unit 4 Imperfect Competition (15–22%), Unit 5 Factor Markets (10–13%), and Unit 6 Market Failure and the Role of Government (8–13%).
The two sections are combined and converted to a final score from 1 to 5. Multiple choice is 66.7% and free response is 33.3%. A score of 3 or higher is generally considered passing and may earn college credit, depending on the college's policy.
Most students find Unit 3 (Production, Cost, and the Perfect Competition Model) and Unit 4 (Imperfect Competition) the most demanding, because they combine cost-curve graphing with the MR = MC profit rule across several market structures. They are also the two highest-weighted units, so they reward the most study time.
Yes. The free-response section regularly asks you to draw and fully label graphs — supply and demand, cost curves, and market-structure diagrams. Correctly labeled axes, curves, and equilibrium points earn points directly, so graphing is one of the highest-yield skills to practice.
Microeconomics studies individual decision-makers — consumers, firms, and specific markets — covering supply and demand, costs, market structures, and factor markets. Macroeconomics studies the whole economy: GDP, inflation, unemployment, and fiscal and monetary policy. The two are separate AP exams that share the same supply-and-demand foundation.
Work through the six units in order — Basic Concepts, Supply and Demand, Production and Costs, Imperfect Competition, Factor Markets, and Market Failure. After each unit take the checkpoint quiz to find gaps, then drill that unit with our free practice questions and flashcards, and re-draw the key graphs from memory before exam day.
Yes — the full guide, the checkpoints, the glossary, the practice questions, and the flashcards are 100% free, with no account required.
References
- 1.College Board. “AP Microeconomics Course and Exam Description (CED).” College Board. ↑
- 2.College Board. “AP Microeconomics — AP Students.” College Board. ↑
- 3.College Board. “AP Microeconomics Exam — AP Central.” College Board. ↑
- 4.College Board. “AP Microeconomics Course — AP Central.” College Board. ↑
- 5.College Board. “AP Microeconomics Free-Response Questions.” College Board. ↑
Sources for the concept answers
Every answer in the AP Microeconomics concept questions above is drawn from an official primary source:
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