---
title: "AP Microeconomics Unit 4 Review: Imperfect Competition"
description: "AP Micro Unit 4 covers Monopolies, Price Discrimination, and Monopolistic Competition. Study guides, practice questions, and key terms for every topic."
canonical: "https://fiveable.me/ap-micro/unit-4"
type: "unit"
subject: "AP Microeconomics"
unit: "Unit 4 – Imperfect Competition"
---

# AP Microeconomics Unit 4 Review: Imperfect Competition

## Overview

Unit 4 covers every major imperfectly competitive market structure: monopoly, monopolistic competition, oligopoly, and monopsony. The core skill is reading and drawing graphs where MR = MC determines quantity, price is read off the demand curve, and P > MC signals allocative inefficiency. Topic 4.5 shifts to payoff matrices and game theory instead of graphs.

## AP CED Alignment

This unit hub is organized around AP Course and Exam Description topics, skills, and exam task types when they are available in the source data.
- Topic 4.1: Introduction to Imperfectly Competitive Markets
- Topic 4.2: Monopoly
- Topic 4.3: Price Discrimination
- Topic 4.4: Monopolistic Competition
- Topic 4.5: Oligopoly and Game Theory
- Topic 4.1: Characteristics of Imperfectly Competitive Markets
- Topic 4.2: Monopoly Graphs and Calculations
- Skill Category 2: Interpretation
- FRQ 3 – Short
- FRQ 2 – Short
- FRQ 1 – Long

## Topics

- [Topic 4.1: Introduction to Imperfectly Competitive Markets](/ap-micro/unit-4/intro-imperfectly-competitive-markets/study-guide/qAJdHoeqKuPXCiAIn4PZ): Defines monopoly, oligopoly, monopolistic competition, and monopsony. Establishes that all imperfectly competitive firms face downward-sloping demand, charge P > MC, and are protected by barriers to entry such as patents, high startup costs, or exclusive resource ownership.
- [Topic 4.2: Monopoly](/ap-micro/unit-4/monopolies/study-guide/BJd48CvY2QF5xDB7MX5N): Covers the monopoly graph in detail: MR = MC determines quantity, price is read off demand, and the profit rectangle and deadweight loss triangle are calculated. Also introduces natural monopoly and the role of barriers to entry in sustaining long-run profit.
- [Topic 4.3: Price Discrimination](/ap-micro/unit-4/price-discrimination/study-guide/Al6taBRp9MAtsUByw8DJ): Explains how a firm with market power charges different prices based on willingness to pay. Perfect price discrimination sets D = MR, produces the competitive quantity, eliminates deadweight loss, and converts all consumer surplus into producer profit.
- [Topic 4.4: Monopolistic Competition](/ap-micro/unit-4/monopolistic-competition/study-guide/CKKifD3UT2sqS7lGTEsc): Analyzes short-run profit or loss and the long-run adjustment to zero economic profit through free entry and exit. In long-run equilibrium, demand is tangent to ATC, but P > MC and excess capacity remain, making the market allocatively inefficient.
- [Topic 4.5: Oligopoly and Game Theory](/ap-micro/unit-4/oligopoly-game-theory/study-guide/mBvl1ZO2oahFuA0W4Zfe): Introduces payoff matrices, dominant strategies, Nash equilibrium, and the prisoner's dilemma. Connects game theory to oligopoly behavior including the incentive to collude, the incentive to cheat on cartels, and how side payments can change strategic outcomes.

## Hardest Topics And Analytics

Snapshot: practice snapshot
This snapshot uses Fiveable practice activity to show where students tend to miss questions and which review moves are worth prioritizing first.
- **63% average MCQ accuracy** (Across 14k multiple-choice practice attempts for this unit.)
- **14k MCQ attempts** (Practice activity included in this snapshot.)
- **37% average FRQ score** (Across 15 scored free-response attempts for this unit.)
- **Topic 4.3: Price Discrimination**: 41% MCQ miss rate across 3431 attempts. Review Price Discrimination with attention to how the concept appears in AP-style source and evidence questions.
- **Topic 4.5: Oligopoly and Game Theory**: 39% MCQ miss rate across 2924 attempts. Review Oligopoly and Game Theory with attention to how the concept appears in AP-style source and evidence questions.
- **Topic 4.4: Monopolistic Competition**: 36% MCQ miss rate across 2232 attempts. Review Monopolistic Competition with attention to how the concept appears in AP-style source and evidence questions.
- **Topic 4.1: Introduction to Imperfectly Competitive Markets**: 31% MCQ miss rate across 2582 attempts. Review Introduction to Imperfectly Competitive Markets with attention to how the concept appears in AP-style source and evidence questions.

## Review Notes

### Topic 4.1: Characteristics of Imperfectly Competitive Markets

Imperfectly competitive markets break at least one assumption of perfect competition. The defining feature is that firms face a downward-sloping demand curve, so they must lower price to sell additional units. This makes marginal revenue fall below price for every unit after the first, and it means price will always exceed marginal cost at the profit-maximizing output. Barriers to entry protect these firms from competition and allow inefficiency to persist.

- **Market structures covered**: Monopoly, oligopoly, and monopolistic competition in product markets; monopsony in factor markets.
- **Downward-sloping demand**: Each firm is a price maker. To sell one more unit, it must lower price on all units, so MR < P for every unit beyond the first.
- **P > MC inefficiency**: When price exceeds marginal cost, the market produces less than the allocatively efficient quantity and deadweight loss results.
- **Barriers to entry**: High fixed or startup costs, patents, legal barriers, exclusive resource ownership, and network externalities all limit entry and sustain market power.

**Checkpoint:** Can you list the four imperfectly competitive structures and explain in one sentence why each one produces P > MC?

Structure | Number of firms | Product type | Barriers to entry | Long-run profit
--- | --- | --- | --- | ---
Monopoly | One | Unique | Very high | Positive
Oligopoly | Few | Similar or differentiated | High | Positive
Monopolistic competition | Many | Differentiated | Low | Zero
Monopsony | One buyer | Homogeneous input | High | Positive (buyer side)

### Topic 4.2: Monopoly Graphs and Calculations

A monopoly is a single seller protected by barriers to entry. It maximizes profit by producing where MR = MC, then reads the price off the demand curve above that quantity. Because price exceeds both marginal cost and average total cost at the profit-maximizing output, the monopolist earns positive economic profit in both the short run and the long run. A natural monopoly occurs when long-run average costs decline throughout the entire range of market demand, making a single firm the lowest-cost producer.

- **Profit-maximizing rule**: Set Q where MR = MC; read P off the demand curve at that Q. Profit = (P - ATC) x Q, shown as a rectangle on the graph.
- **Consumer and producer surplus**: Consumer surplus is the area below demand and above price. Producer surplus is the area above MC and below price up to the monopoly quantity.
- **Deadweight loss**: The triangle between the demand curve and MC curve, from the monopoly quantity to the competitive quantity. It represents trades that would benefit society but do not occur.
- **Natural monopoly**: Long-run average cost declines over the full range of demand. One firm can serve the market more cheaply than two or more firms could.

**Checkpoint:** Given a monopoly graph with labeled demand, MR, MC, and ATC curves, can you identify the profit-maximizing quantity and price, shade the profit rectangle, and shade the deadweight loss triangle?

Outcome | Perfect competition | Monopoly
--- | --- | ---
Price | P = MC | P > MC
Output | Allocatively efficient Q | Below efficient Q
Economic profit (long run) | Zero | Positive
Deadweight loss | None | Positive triangle
Consumer surplus | Maximized | Reduced

### Topic 4.3: Price Discrimination

A firm with market power can charge different prices to different buyers based on willingness to pay. The most tested case is perfect (first-degree) price discrimination, where the monopolist charges each consumer exactly their maximum willingness to pay. This changes the graph significantly: the demand curve becomes the marginal revenue curve, the firm produces where D = MR = MC, all consumer surplus is transferred to the producer as profit, and deadweight loss is eliminated entirely.

- **Conditions for price discrimination**: The firm needs market power, the ability to identify different willingness to pay across buyers, and the ability to prevent resale between groups.
- **Perfect price discrimination graph**: D = MR, so the firm produces the competitive quantity (P = MC at the last unit). No deadweight loss, but all surplus becomes producer surplus.
- **Third-degree price discrimination**: Charging different prices to different groups (students vs. adults, domestic vs. international) based on differences in price elasticity of demand.
- **Surplus redistribution**: Price discrimination does not create new total surplus relative to perfect competition, but it shifts surplus from consumers to the producer.

**Checkpoint:** On a perfect price discrimination graph, can you explain why D = MR, why deadweight loss is zero, and why consumer surplus is zero?

Outcome | Single-price monopoly | Perfect price discrimination
--- | --- | ---
Quantity produced | Below competitive Q | Equal to competitive Q
Consumer surplus | Positive (reduced) | Zero (fully extracted)
Producer surplus / profit | Positive rectangle | Entire area under demand above MC
Deadweight loss | Positive triangle | Zero

### Topic 4.4: Monopolistic Competition

Monopolistic competition combines features of monopoly and perfect competition. Firms sell differentiated products and face downward-sloping demand, giving them some price-making power. In the short run, a firm can earn positive, negative, or zero economic profit. Because barriers to entry are low, positive profit attracts new entrants, shifting each firm's demand curve left until economic profit reaches zero in the long run. The long-run equilibrium has the demand curve tangent to ATC, so P = ATC but P > MC, meaning the firm still operates with excess capacity.

- **Short-run equilibrium**: Firm sets Q where MR = MC and reads P off demand. Profit or loss depends on whether P is above or below ATC at that quantity.
- **Long-run equilibrium**: Free entry and exit drive economic profit to zero. Demand shifts left (entry) or right (exit) until the demand curve is tangent to ATC.
- **Excess capacity**: In long-run equilibrium, the firm produces less than the output that minimizes ATC. The gap between actual output and minimum-ATC output is excess capacity.
- **Allocative inefficiency**: Even in long-run equilibrium, P > MC, so the market underproduces relative to the socially optimal quantity and deadweight loss persists.
- **Product differentiation and advertising**: Firms use advertising and non-price competition to shift demand rightward and make it less elastic, maintaining some pricing power.

**Checkpoint:** Draw the long-run monopolistic competition graph. Label the point where demand is tangent to ATC, mark the MR = MC quantity, and explain why P > MC even though economic profit is zero.

### Topic 4.5: Oligopoly and Game Theory

An oligopoly has a few large firms with high barriers to entry. Because each firm's profit depends on rivals' choices, firms are mutually interdependent. Game theory provides the tools to analyze these decisions. A payoff matrix shows each player's outcomes for every combination of strategies. A dominant strategy is best regardless of what the rival does. A Nash equilibrium is any outcome where no player can improve their payoff by changing strategy alone. The prisoner's dilemma shows why firms have an incentive to cheat on collusive agreements even when cooperation would raise joint profits.

- **Dominant strategy**: A strategy that gives a higher payoff than any alternative, no matter what the other player chooses. Not every game has one.
- **Nash equilibrium**: A set of strategies where no player can increase their payoff by making a unilateral deviation. It is found by checking best responses for each player.
- **Prisoner's dilemma**: A game where individual incentives lead both players to a dominant strategy that produces a worse outcome for both than mutual cooperation would.
- **Collusion and cartels**: Oligopolists have an incentive to collude and act like a monopolist, but each firm also has an incentive to cheat by undercutting the agreed price or exceeding the output quota.
- **Incentive to alter dominant strategy**: A side payment or penalty large enough to change the payoff structure so that a player's best response switches from the original dominant strategy to cooperation.

**Checkpoint:** Given a two-by-two payoff matrix, can you identify each player's dominant strategy, find the Nash equilibrium, and calculate how large a side payment would need to be to change a player's dominant strategy?

Concept | Definition | How to find it
--- | --- | ---
Dominant strategy | Best response regardless of rival's choice | Compare payoffs row by row (or column by column) for each player
Nash equilibrium | No player wants to deviate unilaterally | Check that each player is playing a best response to the other's strategy
Prisoner's dilemma outcome | Both players choose dominant strategy, both worse off than cooperation | Identify dominant strategies; note joint payoff is lower than cooperative payoff

## Study Guides

- [4.3 Price Discrimination](/ap-micro/unit-4/price-discrimination/study-guide/Al6taBRp9MAtsUByw8DJ)
- [4.2 Monopolies](/ap-micro/unit-4/monopolies/study-guide/BJd48CvY2QF5xDB7MX5N)
- [4.4 Monopolistic Competition](/ap-micro/unit-4/monopolistic-competition/study-guide/CKKifD3UT2sqS7lGTEsc)
- [4.5 Oligopoly and Game Theory](/ap-micro/unit-4/oligopoly-game-theory/study-guide/mBvl1ZO2oahFuA0W4Zfe)
- [4.1 Introduction to Imperfectly Competitive Markets](/ap-micro/unit-4/intro-imperfectly-competitive-markets/study-guide/qAJdHoeqKuPXCiAIn4PZ)

## Practice Preview

### Multiple-choice practice

- **AP-style practice question**: Skill Category 2: Interpretation | Two factories choose between installing filters or not. Factory A saves $100 by not installing filters if Factory B installs them, and saves $60 by not installing if Factory B does not install them. Factory A has a dominant strategy to not install filters. What is the minimum penalty for not installing filters that ensures Factory A installs them?
- **AP-style practice question**: Skill Category 2: Interpretation | A firm faces the demand curve $$P = 40 - Q$$ and has a constant average total cost of $$20$$. What is the firm's maximum profit?
- **AP-style practice question**: Skill Category 2: Interpretation | A monopolistically competitive firm faces the demand curve $$P = 60 - 2Q$$ and has a constant marginal cost of $$MC = 20$$. If the firm has no fixed costs, what is the short-run profit and the likely long-run adjustment?
- **AP-style practice question**: Skill Category 2: Interpretation | A firm in monopolistic competition faces the demand function $$P = 100 - Q$$. It maximizes profit by producing $$30$$ units at a price of $$70$$. What is the value of consumer surplus in this market?
- **AP-style practice question**: Skill Category 2: Interpretation | At its profit-maximizing quantity of 20 units, a firm's price is $$40$$, marginal cost is $$20$$, and average total cost is $$30$$. If the socially optimal quantity is 30 units (where price equals marginal cost at $$20$$), what is the deadweight loss?
- **AP-style practice question**: Skill Category 2: Interpretation | A firm sells 500 units at a price of $$20$$. Its average total cost is $$25$$ and its average variable cost is $$15$$. What is the firm's financial situation and short-run decision?

### FRQ practice

- **Monopoly pricing, output, and profit maximization**: FRQ 3 – Short | Monopoly pricing, output, and profit maximization
- **Monopoly pricing, regulation, and economic profit**: FRQ 2 – Short | Monopoly pricing, regulation, and economic profit
- **Monopoly pricing, profit-maximizing output, lump-sum taxation effects**: FRQ 1 – Long | Monopoly pricing, profit-maximizing output, lump-sum taxation effects

## Key Terms

- **Market Power**: The ability of a firm to set price above marginal cost because it faces a downward-sloping demand curve rather than a perfectly elastic one.
- **Marginal Revenue (MR)**: The additional revenue from selling one more unit. For an imperfect competitor, MR is less than price because the firm must lower price on all units to sell one more.
- **Barriers to Entry**: Obstacles that prevent new firms from entering a market, including high startup costs, patents, legal restrictions, and exclusive resource ownership. They allow imperfect competitors to earn long-run profit.
- **Deadweight Loss**: The loss of total surplus that occurs when a market produces less than the allocatively efficient quantity. In imperfect competition, it appears as a triangle between the demand curve and MC from the monopoly quantity to the competitive quantity.
- **allocative inefficiency**: A market outcome where price exceeds marginal cost, causing underproduction relative to the socially optimal level and generating deadweight loss.
- **Natural Monopoly**: A market where long-run average costs decline over the full range of demand, making a single firm the lowest-cost producer and creating a barrier to entry for rivals.
- **perfect price discrimination**: A pricing strategy where a monopolist charges each consumer their maximum willingness to pay, producing the competitive quantity, extracting all consumer surplus as profit, and eliminating deadweight loss.
- **Differentiated products**: Goods that are distinct in quality, features, or branding, allowing monopolistically competitive firms to have some pricing power even with many competitors.
- **dominant strategy**: A strategy that yields a higher payoff for a player regardless of what the other player chooses. When both players have dominant strategies, the result is a dominant strategy equilibrium.
- **collusion**: An agreement among oligopolistic firms to coordinate prices or output to increase joint profits, effectively acting like a monopolist. Collusion is unstable because each firm has an incentive to cheat.
- **Prisoner's Dilemma**: A game theory scenario where individual incentives lead both players to a dominant strategy that produces a worse joint outcome than cooperation would, explaining why cartels tend to break down.

## Common Mistakes

- **Confusing the profit-maximizing quantity with the price**: MR = MC gives you the quantity, not the price. After finding Q, you must go up to the demand curve to read the price. Drawing the price at the MR = MC intersection is one of the most common graph errors in this unit.
- **Thinking perfect price discrimination is more inefficient than single-price monopoly**: It is actually less inefficient. Perfect price discrimination eliminates deadweight loss because the firm produces the competitive quantity. The inefficiency shifts from quantity distortion to full surplus extraction, but total surplus equals the competitive outcome.
- **Assuming monopolistic competition is efficient in the long run because profit is zero**: Zero economic profit means P = ATC, not P = MC. The firm still charges above marginal cost and produces below the ATC-minimizing output, so allocative inefficiency and excess capacity both persist in long-run equilibrium.
- **Treating every Nash equilibrium as a dominant strategy equilibrium**: A dominant strategy equilibrium is a Nash equilibrium, but not every Nash equilibrium involves dominant strategies. In some games, a Nash equilibrium exists only because each player is best-responding to the other, not because one strategy dominates all others.
- **Forgetting that the MR curve has the same intercept as demand but twice the slope**: For a linear demand curve, MR starts at the same vertical intercept and falls at twice the rate. This means MR hits the horizontal axis at the midpoint of the demand curve's horizontal intercept, which matters for correctly drawing graphs and finding quantities.

## Exam Connections

- **Graph drawing and area calculation**: AP Micro free-response questions frequently ask you to draw a correctly labeled imperfect competition graph and then identify or calculate specific areas. You should be ready to shade and calculate the profit rectangle as (P - ATC) x Q, the consumer surplus triangle, and the deadweight loss triangle using coordinates read from a graph or provided in a table. Both monopoly and monopolistic competition graphs appear in this format.
- **Comparing market structures**: Multiple-choice and free-response questions often ask you to compare outcomes across market structures, such as explaining why a monopoly produces less and charges more than a perfectly competitive market, or why a monopolistically competitive firm has excess capacity in long-run equilibrium even though economic profit is zero. Be precise about which inefficiency (allocative, productive, or both) applies to each structure.
- **Payoff matrix analysis**: Oligopoly questions typically present a two-by-two payoff matrix and ask you to identify dominant strategies, find the Nash equilibrium, explain whether the outcome is a prisoner's dilemma, or calculate the minimum payment needed to change a player's strategy. Unlike other Unit 4 topics, this task uses a table rather than a graph, and the calculation skill (finding the incentive sufficient to alter a dominant strategy) is explicitly tested.

## Final Review Checklist

- **Draw and label the monopoly graph**: Include downward-sloping demand, MR below demand, upward-sloping MC, and ATC. Mark the MR = MC quantity, read price off demand, shade the profit rectangle as (P - ATC) x Q, and shade the deadweight loss triangle.
- **Explain why MR lies below demand for an imperfect competitor**: A price maker must lower price on all units to sell one more, so the revenue gained on the new unit is less than its price. This makes MR < P and causes MR to decline faster than demand.
- **Compare single-price monopoly to perfect price discrimination**: In single-price monopoly: Q < competitive Q, consumer surplus exists, deadweight loss exists. In perfect price discrimination: Q = competitive Q, consumer surplus = 0, deadweight loss = 0, all surplus is producer profit.
- **Describe the long-run monopolistic competition equilibrium**: Free entry eliminates economic profit until demand is tangent to ATC. At that point P = ATC (zero profit), but P > MC (allocative inefficiency) and output is below the ATC-minimizing level (excess capacity).
- **Read a payoff matrix and find dominant strategies and Nash equilibrium**: For each player, compare payoffs across the rival's possible choices. A dominant strategy is best in every column (or row). A Nash equilibrium is the cell where both players are playing best responses simultaneously.
- **Explain why cartels are unstable using the prisoner's dilemma**: Each firm earns more by cheating (undercutting price or exceeding output quota) regardless of what the rival does, so cheating is a dominant strategy. The Nash equilibrium is mutual defection, even though mutual cooperation would yield higher joint profits.
- **Calculate areas on imperfect competition graphs**: Practice computing consumer surplus (triangle above price under demand), producer surplus (area above MC below price), profit rectangles, and deadweight loss triangles using coordinates from graphs or data tables.

## Study Plan

- **Step 1: Build the foundation with Topic 4.1**: Read the Topic 4.1 guide and make sure you can list all four imperfectly competitive structures, explain why each faces a downward-sloping demand curve, and identify at least three types of barriers to entry. This framing applies to every topic that follows.
- **Step 2: Practice monopoly graphs with Topic 4.2**: Draw the monopoly graph from scratch five times without looking at notes. Each time, label demand, MR, MC, and ATC; mark the MR = MC quantity; read the price off demand; and shade the profit rectangle and deadweight loss triangle. Use the Topic 4.2 guide to check your work.
- **Step 3: Work through price discrimination scenarios with Topic 4.3**: Use the Topic 4.3 guide to compare the single-price monopoly graph to the perfect price discrimination graph side by side. Practice explaining what happens to consumer surplus, producer surplus, and deadweight loss in each case, and practice calculating those areas from a graph.
- **Step 4: Draw both short-run and long-run monopolistic competition graphs with Topic 4.4**: Draw a short-run graph showing positive profit, then show how entry shifts demand left until it is tangent to ATC in the long run. Label excess capacity as the gap between actual output and minimum-ATC output. Use the Topic 4.4 guide to confirm the long-run tangency condition.
- **Step 5: Work payoff matrix problems with Topic 4.5**: Use the Topic 4.5 guide to practice reading payoff matrices. For each matrix, identify dominant strategies for both players, find the Nash equilibrium, and check whether the outcome is a prisoner's dilemma. Then practice calculating the minimum side payment needed to change a player's dominant strategy.

## More Ways To Review

- [Topic study guides](/ap-micro/unit-4#topics)
- [FRQ practice](/ap-micro/frq-practice)
- [Cram archive videos](/cram-archives?subject=ap-microeconomics&unit=unit-4)
- [Cheatsheets](/ap-micro/cheatsheets/unit-4)
- [Key terms](/ap-micro/key-terms)

## FAQs

### What topics are covered in AP Micro Unit 4?

AP Micro Unit 4 covers 5 topics across imperfect competition: Introduction to Imperfectly Competitive Markets (4.1), Monopoly (4.2), Price Discrimination (4.3), Monopolistic Competition (4.4), and Oligopoly and Game Theory (4.5). Together they explain how real-world firms set prices when they have market power, unlike the perfectly competitive model. See the full topic breakdown at [/ap-micro/unit-4](/ap-micro/unit-4).

### How much of the AP Micro exam is Unit 4?

AP Micro Unit 4 makes up 15-22% of the AP exam, making it one of the heavier-weighted units. It covers imperfect competition, including monopoly, price discrimination, monopolistic competition, and oligopoly with game theory. Expect several multiple-choice questions and possible FRQ components drawn directly from these topics.

### What's on the AP Micro Unit 4 progress check (MCQ and FRQ)?

The AP Micro Unit 4 progress check in AP Classroom includes both MCQ and FRQ parts drawn from all five unit topics: imperfectly competitive markets, monopoly, price discrimination, monopolistic competition, and oligopoly and game theory. The MCQ section tests graph reading and concept identification, while the FRQ section asks you to analyze firm behavior and market outcomes. For matched practice on every topic the progress check covers, visit [/ap-micro/unit-4](/ap-micro/unit-4).

### How do I practice AP Micro Unit 4 FRQs?

AP Micro Unit 4 FRQs most often focus on monopoly profit maximization, price discrimination scenarios, and oligopoly game theory payoff matrices. A typical question gives you a graph or table and asks you to identify output, price, profit, and deadweight loss, or to find a dominant strategy in a game theory problem. Practice by drawing the monopoly and monopolistic competition graphs from scratch, labeling every curve, and writing out your reasoning step by step. Find Unit 4 FRQ practice at [/ap-micro/unit-4](/ap-micro/unit-4).

### Where can I find AP Micro Unit 4 practice questions?

The best place to find AP Micro Unit 4 practice questions, including multiple-choice and practice test sets, is [/ap-micro/unit-4](/ap-micro/unit-4). That page has resources covering all five topics: monopoly, price discrimination, monopolistic competition, and oligopoly with game theory. Mixing MCQ drills with full practice tests helps you get comfortable with both graph-based questions and written analysis.

### How should I study AP Micro Unit 4?

Start with monopoly, since it anchors the whole unit. Make sure you can draw the monopoly graph, find the profit-maximizing output where MR equals MC, mark the price on the demand curve, and shade in profit or loss. Then layer in price discrimination, monopolistic competition, and oligopoly. For game theory, practice reading payoff matrices and finding dominant strategies until it feels automatic. A solid study plan: one topic per session, draw every graph by hand, then test yourself with mixed MCQ before moving on. Full topic guides and practice are at [/ap-micro/unit-4](/ap-micro/unit-4).

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