---
title: "AP Microeconomics Unit 5 Review: Factor Markets | Fiveable"
description: "AP Micro Unit 5 covers Introduction to Factor Markets and Changes in Factor Demand and Factor Supply. Study guides, practice questions, and key terms."
canonical: "https://fiveable.me/ap-micro/unit-5"
type: "unit"
subject: "AP Microeconomics"
unit: "Unit 5 – Factor Markets"
---

# AP Microeconomics Unit 5 Review: Factor Markets | Fiveable

## Overview

Unit 5 covers how firms decide how many workers and other inputs to hire by comparing marginal revenue product to marginal resource cost. Topics move from the basics of factor markets and derived demand, through shifts in labor supply and demand, to profit-maximizing hiring in competitive markets, and finally to monopsony where a single employer sets wages below the competitive level.

## 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 5.1: Introduction to Factor Markets
- Topic 5.2: Changes in Factor Demand and Factor Supply
- Topic 5.3: Profit-Maximizing Behavior in Perfectly Competitive Factor Markets
- Topic 5.4: Monopsonistic Markets
- Topic 5.2: Shifts in Factor Demand and Factor Supply
- Topic 5.3: Perfectly Competitive Factor Markets
- Topic 5.4: Monopsonistic Labor Markets
- Skill Category 1: Principles and Models
- Skill Category 3: Manipulation
- FRQ 3 – Short
- FRQ 2 – Short
- FRQ 1 – Long

## Topics

- [Topic 5.1: Introduction to Factor Markets](/ap-micro/unit-5/intro-factor-markets/study-guide/pwArfJpGkiQNHkjkRJe8): Defines factors of production (labor, capital, land), their factor prices (wages, interest, rent), derived demand, and the core MRP = MRC hiring rule with calculation practice.
- [Topic 5.2: Changes in Factor Demand and Factor Supply](/ap-micro/unit-5/changes-factor-demand-factor-supply/study-guide/0IIdcKCqjk97CeKAPC0V): Covers what shifts the labor demand curve (output price, productivity) and the labor supply curve (immigration, education, working conditions, leisure preferences), and how to predict new equilibrium wages and employment.
- [Topic 5.3: Profit-Maximizing Behavior in Perfectly Competitive Factor Markets](/ap-micro/unit-5/profit-maximizing-behavior-perfectly-competitive-factor-markets/study-guide/eAu2TJS5gZwvjuZTlTF1): Explains the two-panel competitive labor market graph, the wage-taker firm, the MRP = wage hiring rule, the VMP concept, and the cost-minimization rule MPL/w = MPK/r.
- [Topic 5.4: Monopsonistic Markets](/ap-micro/unit-5/monopsonistic-markets/study-guide/0xBQAaC4q2GeMFvurLsg): Covers the monopsony graph with upward-sloping labor supply, MFC above supply, the MRP = MFC hiring rule, the lower wage outcome, deadweight loss, and the unique effect of a minimum wage in monopsony.

## 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.
- **67% average MCQ accuracy** (Across 10k multiple-choice practice attempts for this unit.)
- **10k MCQ attempts** (Practice activity included in this snapshot.)
- **44% average FRQ score** (Across 8 scored free-response attempts for this unit.)
- **Topic 5.3: Profit-Maximizing Behavior in Perfectly Competitive Factor Markets**: 31% MCQ miss rate across 3305 attempts. Review Profit-Maximizing Behavior in Perfectly Competitive Factor Markets with attention to how the concept appears in AP-style source and evidence questions.
- **Topic 5.2: Changes in Factor Demand and Factor Supply**: 30% MCQ miss rate across 2974 attempts. Review Changes in Factor Demand and Factor Supply with attention to how the concept appears in AP-style source and evidence questions.

## Review Notes

### Topic 5.1: Introduction to Factor Markets

Factor markets are where firms (buyers) purchase inputs from households (sellers). The three main factors are labor, capital, and land, which earn wages, interest, and rent respectively. Demand for any factor is a derived demand because it depends on the demand for the final good the factor helps produce. Firms compare marginal revenue product to marginal resource cost to decide how many units of a factor to hire.

- **Marginal Revenue Product (MRP)**: The additional revenue a firm earns from hiring one more unit of a factor. MRP = MPL x MR. In a competitive output market, MRP = MPL x Price.
- **Marginal Resource Cost (MRC)**: The additional cost of hiring one more unit of a factor. In a competitive factor market, MRC equals the market wage.
- **Profit-maximizing hiring rule**: Hire additional units of a factor as long as MRP is greater than MRC; stop where MRP = MRC.
- **Derived demand**: Labor demand is derived from product demand. If the price of the output rises, the MRP of labor rises and the firm demands more labor at every wage.
- **Diminishing marginal returns**: As more labor is added with capital fixed, MPL eventually falls, causing MRP to fall. This gives the labor demand curve its downward slope.

**Checkpoint:** Given a table showing output at each quantity of labor, calculate MPL, then MRP at a given output price, and identify the profit-maximizing number of workers at a stated wage.

Factor | Factor Price | Market
--- | --- | ---
Labor | Wage | Labor market
Capital | Interest rate | Capital market
Land | Rent | Land market

### Topic 5.2: Shifts in Factor Demand and Factor Supply

The labor demand curve shifts when the determinants of MRP change. The labor supply curve shifts when workers' willingness to supply labor at each wage changes. Understanding what shifts each curve and in which direction is essential for analyzing changes in equilibrium wages and employment.

- **Labor demand shifters**: Output price changes, changes in worker productivity, and changes in the price of related inputs (substitutes or complements in production) all shift the labor demand curve.
- **Labor supply shifters**: Immigration, changes in education levels, working conditions, age distribution of the population, availability of alternative jobs, preferences for leisure, and cultural expectations all shift labor supply.
- **Movement along vs. shift**: A change in the wage causes a movement along the labor demand or supply curve. A change in a determinant other than the wage causes the entire curve to shift.
- **Productivity and labor demand**: If workers become more productive (e.g., due to better technology or training), MPL rises, MRP rises at every quantity, and the labor demand curve shifts right.
- **Immigration and labor supply**: An increase in immigration expands the pool of available workers, shifting labor supply right, which lowers the equilibrium wage and increases equilibrium employment.

**Checkpoint:** Identify whether a given event (e.g., a rise in the price of the output good, an influx of immigrant workers) shifts labor demand or labor supply, and predict the direction of the shift and the effect on equilibrium wage and employment.

Curve | Shifts Right When | Shifts Left When
--- | --- | ---
Labor Demand | Output price rises or productivity increases | Output price falls or productivity decreases
Labor Supply | Immigration increases or preferences for leisure fall | Population ages or preferences for leisure rise

### Topic 5.3: Perfectly Competitive Factor Markets

In a perfectly competitive labor market, many firms compete to hire from many workers. The market wage is determined by the intersection of market labor supply and market labor demand. Each individual firm is a wage taker and faces a perfectly elastic (horizontal) labor supply curve at the market wage. The firm hires where MRP equals the wage, which also equals MRC in this market structure.

- **Wage taker**: A firm in a competitive labor market accepts the market wage as given and can hire any number of workers at that wage without affecting it.
- **MRP = Wage (hiring rule)**: Because MRC equals the wage in a competitive factor market, the firm hires until MRP = wage. The MRP curve is the firm's labor demand curve.
- **Value of Marginal Product (VMP)**: VMP = MPL x Price. In a competitive output market, VMP equals MRP. It measures the dollar value of the extra output produced by one more worker.
- **Cost minimization rule**: To minimize costs across multiple inputs, a firm allocates inputs so that MPL/w = MPK/r, meaning the last dollar spent on each input yields the same marginal product.
- **Two-panel graph**: The market panel shows the equilibrium wage where market labor supply meets market labor demand. The firm panel shows a horizontal MRC line at that wage and a downward-sloping MRP curve; the firm hires where they intersect.

**Checkpoint:** Draw the two-panel competitive labor market graph. Label the market wage, the firm's MRC line, the MRP curve, and the profit-maximizing quantity of labor. Then calculate MRP from a table and confirm the hiring decision.

### Topic 5.4: Monopsonistic Labor Markets

A monopsony is a labor market with a single employer. Because the firm is the only buyer of labor, it faces the entire upward-sloping market labor supply curve. To hire one more worker, it must raise the wage for all workers, making the marginal factor cost (MFC) greater than the wage at every quantity. The firm hires where MRP = MFC, then pays the wage read off the labor supply curve at that quantity, which is below the competitive wage.

- **Monopsonist**: A single employer in a labor market who has the power to set wages. Examples include a dominant employer in a small town or a specialized industry with few firms.
- **MFC greater than wage**: Because hiring one more worker requires raising wages for all existing workers, MFC exceeds the labor supply curve at every quantity of labor.
- **Monopsony hiring rule**: The firm hires where MRP = MFC, then pays the wage shown on the labor supply curve at that employment level, not the MFC value.
- **Monopsony vs. competitive outcome**: Compared to a competitive market, a monopsony hires fewer workers and pays a lower wage, creating deadweight loss.
- **Minimum wage in monopsony**: A minimum wage set between the monopsony wage and the competitive wage can increase both employment and wages in a monopsonistic market, unlike in a competitive market where a binding minimum wage reduces employment.

**Checkpoint:** Given a monopsony graph with MRP, MFC, and labor supply curves labeled, identify the profit-maximizing quantity of labor, the wage the firm pays, and explain why MFC lies above the labor supply curve.

Feature | Competitive Labor Market | Monopsony
--- | --- | ---
Number of employers | Many | One
Firm's labor supply curve | Horizontal (perfectly elastic) | Upward sloping (market supply)
MRC vs. wage | MRC = wage | MFC > wage
Hiring rule | MRP = wage | MRP = MFC
Wage outcome | Competitive wage | Below competitive wage

## Study Guides

- [5.2 Changes in Factor Demand and Factor Supply](/ap-micro/unit-5/changes-factor-demand-factor-supply/study-guide/0IIdcKCqjk97CeKAPC0V)
- [5.4 Monopsony Markets](/ap-micro/unit-5/monopsonistic-markets/study-guide/0xBQAaC4q2GeMFvurLsg)
- [5.3 Perfectly Competitive Labor Markets](/ap-micro/unit-5/profit-maximizing-behavior-perfectly-competitive-factor-markets/study-guide/eAu2TJS5gZwvjuZTlTF1)
- [5.1 Introduction to Factor Markets](/ap-micro/unit-5/intro-factor-markets/study-guide/pwArfJpGkiQNHkjkRJe8)

## Practice Preview

### Multiple-choice practice

- **AP-style practice question**: Skill Category 1: Principles and Models | Consider a perfectly competitive labor market and a monopsonistic labor market. If the labor supply curve shifts rightward in both markets, how does the profit-maximizing response differ?
- **AP-style practice question**: Skill Category 3: Manipulation | A firm sells apples in a perfectly competitive market at a price of $$2$$ per unit and hires labor in a perfectly competitive market at a wage of $$15$$ per hour. The marginal product of the first four workers is 10, 8, 6, and 4 units respectively. If an increase in consumer demand raises apple prices to $$4$$ per unit, how does the firm's profit-maximizing employment level change?
- **AP-style practice question**: Skill Category 3: Manipulation | A perfectly competitive firm hires workers with the following marginal product schedule: 1st worker = 20 units, 2nd = 15 units, 3rd = 10 units, 4th = 5 units. The product sells for $$10$$. Due to an influx of new workers into the region, the market wage falls from $$180$$ to $$80$$. What is the effect on the firm's hiring?
- **AP-style practice question**: Skill Category 3: Manipulation | A firm produces gadgets selling for $$5$$ each. The current wage rate is $$40$$. New software doubles the marginal product of every worker. The original marginal products of the first three workers were 10, 6, and 4 units. How many *additional* workers will the firm hire after adopting the software?
- **AP-style practice question**: Skill Category 3: Manipulation | A firm sells widgets for $$4$$ and pays a wage of $$20$$. The marginal product of labor is given by $$MP = 8 - L$$, where $$L$$ is the number of workers. If a recession lowers the widget price to $$2$$, what is the change in the profit-maximizing quantity of labor?
- **AP-style practice question**: Skill Category 3: Manipulation | A firm uses labor and machines to produce toys. The price of machines decreases, causing the marginal product of every worker to increase by 2 units. The product price is $$10$$ and the wage is $$50$$. The original marginal products of the first four workers were 8, 6, 4, and 2 units. What is the new profit-maximizing number of workers?

### FRQ practice

- **Profit-maximizing labor hiring in competitive markets**: FRQ 3 – Short | Profit-maximizing labor hiring in competitive markets
- **Profit-maximizing labor hiring decisions and wage costs**: FRQ 2 – Short | Profit-maximizing labor hiring decisions and wage costs
- **Competitive labor market effects of price and wage policy**: FRQ 1 – Long | Competitive labor market effects of price and wage policy

## Key Terms

- **Derived Demand**: The demand for a factor of production that depends on the demand for the final good the factor helps produce. Labor demand rises when output price or worker productivity rises.
- **MFC equals MRP**: The profit-maximizing hiring condition. A firm hires additional labor as long as MRP exceeds MFC and stops where they are equal.
- **Factors of Production**: The inputs used to produce goods and services: labor, capital, and land. Each earns a factor price: wages, interest, and rent respectively.
- **Labor Demand**: The quantity of labor firms are willing to hire at each wage rate. It slopes downward because MRP falls as more labor is hired. It shifts when output price or worker productivity changes.
- **Labor Supply**: The quantity of labor workers are willing to offer at each wage rate. It slopes upward. It shifts due to immigration, education, working conditions, leisure preferences, and demographic changes.
- **wage rate**: The price of labor per unit of time. In a competitive labor market, it is determined by market supply and demand and is taken as given by individual firms.
- **Marginal Product**: The additional output produced by hiring one more unit of a factor, with all other inputs held constant. Diminishing marginal returns cause MPL to fall as more labor is added.
- **monopsonist**: A single employer in a labor market who faces the entire upward-sloping labor supply curve and has the power to set wages below the competitive level.
- **monopsonistic labor market**: A labor market with one dominant employer. The firm hires where MRP = MFC and pays the wage from the labor supply curve, resulting in lower employment and wages than a competitive market.
- **Demand Curve for Labor**: A downward-sloping curve showing the quantity of labor firms demand at each wage. It is equivalent to the MRP curve for the firm.
- **Minimum wage**: A legally set floor on wages. In a competitive labor market, a binding minimum wage above equilibrium reduces employment. In a monopsony, a minimum wage between the monopsony wage and the competitive wage can increase both wages and employment.

## Common Mistakes

- **Paying the MFC wage instead of the supply curve wage in monopsony**: In a monopsony, the firm hires where MRP = MFC, but it pays the wage shown on the labor supply curve at that quantity, not the MFC value. The MFC point is only used to find how many workers to hire.
- **Confusing a shift in labor demand with a movement along it**: A change in the wage causes a movement along the labor demand curve. Only changes in output price, worker productivity, or the price of related inputs shift the entire labor demand curve.
- **Using MR = Price for imperfect competitors in output markets**: MRP = MPL x MR. For a firm that is a price taker in the output market, MR = Price, so MRP = MPL x Price = VMP. For a monopolist or oligopolist in the output market, MR is less than Price, so MRP is less than VMP.
- **Assuming a minimum wage always reduces employment**: In a competitive labor market, a binding minimum wage above the equilibrium wage reduces employment. In a monopsony, a minimum wage set between the monopsony wage and the competitive wage can increase employment. The market structure determines the outcome.
- **Forgetting that a firm can be a wage taker in the labor market even if it has output market power**: A monopolist in its product market can still be a perfectly competitive buyer of labor if there are many employers competing for workers. Market structure in the output market and the factor market are determined separately.

## Exam Connections

- **Graph drawing and labeling**: AP Micro frequently asks students to draw and fully label factor market graphs. For competitive labor markets, you need both the market panel (equilibrium wage) and the firm panel (horizontal MRC, downward-sloping MRP, and the hiring quantity). For monopsony, you need the upward-sloping labor supply, the MFC curve above it, the MRP curve, and the two-step process to find quantity and wage. Incomplete labels or missing curves cost points.
- **Calculation from tables**: Exam questions often provide a table of labor quantities and total output, then ask you to calculate MPL, MRP at a given output price, and the profit-maximizing number of workers at a stated wage. You may also be asked to apply the cost-minimization rule MPL/w = MPK/r to determine whether a firm should shift spending between inputs.
- **Comparative analysis across market structures**: Questions may ask you to compare outcomes in competitive versus monopsonistic labor markets, including differences in wage, employment level, and efficiency. The effect of a minimum wage is a common comparison task because the direction of the employment effect depends entirely on whether the market is competitive or monopsonistic.

## Final Review Checklist

- **Unit 5 Final review checklist**: Use this list to confirm you can handle every major skill in Unit 5 before the exam.
- **Calculate MRP from a table**: Given output at each labor quantity and an output price, compute MPL, then MRP = MPL x Price (or MPL x MR for imperfect competitors), and identify the profit-maximizing hiring level at a given wage.
- **Identify and explain derived demand**: Explain why a change in the price of the final good or a change in worker productivity shifts the labor demand curve, and predict the direction of the shift.
- **Shift labor supply correctly**: List the determinants of labor supply (immigration, education, working conditions, age distribution, alternative options, leisure preferences, cultural expectations) and predict how each shifts the curve and affects equilibrium wage and employment.
- **Draw and interpret the two-panel competitive labor market graph**: Show the market panel with equilibrium wage and the firm panel with a horizontal MRC line, a downward-sloping MRP curve, and the profit-maximizing quantity of labor where they intersect.
- **Apply the cost-minimization rule**: Use MPL/w = MPK/r to determine whether a firm should reallocate spending between labor and capital to minimize costs for a given output level.
- **Read a monopsony graph accurately**: Identify the MRP = MFC intersection to find the quantity hired, then drop to the labor supply curve to find the wage paid. Explain why MFC lies above the supply curve and why employment and wages are lower than in a competitive market.
- **Explain the minimum wage effect in monopsony**: Describe why a minimum wage set between the monopsony wage and the competitive wage can raise both the wage and employment in a monopsonistic market.

## Study Plan

- **Step 1: Build the MRP = MRC framework (Topic 5.1)**: Read the Topic 5.1 guide and practice calculating MPL and MRP from a data table. Confirm you can identify the profit-maximizing quantity of labor at a given wage before moving on, since every later topic builds on this rule.
- **Step 2: Practice shifting labor demand and supply (Topic 5.2)**: Work through the Topic 5.2 guide and list every determinant of labor demand and labor supply. For each determinant, draw the shift and state the effect on equilibrium wage and employment. Use the comparison table in the review notes to check your reasoning.
- **Step 3: Understand the two-panel competitive labor market graph (Topic 5.3)**: Draw the market and firm panels from memory using the Topic 5.3 guide. Practice labeling the equilibrium wage, the firm's horizontal MRC line, the MRP curve, and the hiring quantity. Then apply the cost-minimization rule MPL/w = MPK/r with a numerical example.
- **Step 4: Work through the monopsony graph step by step (Topic 5.4)**: Use the Topic 5.4 guide to practice the two-step monopsony process: find MRP = MFC to get the quantity, then read the wage from the labor supply curve. Compare the monopsony outcome to the competitive outcome and explain the deadweight loss and the minimum wage effect.
- **Step 5: Review with practice questions and estimate your score**: Use the 25+ available practice questions to test calculation and graph-reading skills across all four topics. After reviewing your results, use the AP score calculator to estimate where you stand and identify which topics need more attention.

## More Ways To Review

- [Topic study guides](/ap-micro/unit-5#topics)
- [FRQ practice](/ap-micro/frq-practice)
- [Cram archive videos](/cram-archives?subject=ap-microeconomics&unit=unit-5)
- [Cheatsheets](/ap-micro/cheatsheets/unit-5)
- [Key terms](/ap-micro/key-terms)

## FAQs

### What topics are covered in AP Micro Unit 5?

AP Micro Unit 5 covers factor markets across 4 topics: Introduction to Factor Markets (5.1), Changes in Factor Demand and Factor Supply (5.2), Profit-Maximizing Behavior in Perfectly Competitive Factor Markets (5.3), and Monopsonistic Markets (5.4). You'll learn how wages and resource prices are determined, how firms hire using marginal revenue product, and what happens when a single buyer controls a labor market. See the full topic list at [/ap-micro/unit-5](/ap-micro/unit-5).

### How much of the AP Micro exam is Unit 5?

Factor markets make up 10-13% of the AP Micro exam, so you can expect roughly 5-7 multiple-choice questions drawn from this unit. The unit covers how resource prices are determined, how firms decide how much labor or capital to hire, and how monopsonistic markets differ from competitive ones. It's a focused unit with a reliable payoff on exam day. Get a full breakdown at [/ap-micro/unit-5](/ap-micro/unit-5).

### What's on the AP Micro Unit 5 progress check (MCQ and FRQ)?

The AP Micro Unit 5 progress check includes both MCQ and FRQ parts that test all four factor market topics. The MCQ section covers concepts like marginal revenue product, marginal resource cost, shifts in factor demand and supply, and monopsony wage and employment outcomes. The FRQ part typically asks you to draw and interpret factor market graphs, identify profit-maximizing hiring rules, and analyze the effects of a monopsonist compared to a competitive market. Practice questions matched to this progress check are at [/ap-micro/unit-5](/ap-micro/unit-5).

### How do I practice AP Micro Unit 5 FRQs?

AP Micro Unit 5 FRQs most often come from Topics 5.3 and 5.4, asking you to draw a perfectly competitive factor market or a monopsony graph, label the profit-maximizing quantity of labor, and compare wages under different market structures. To practice, sketch the MRP and MRC curves from memory, then work through questions that ask you to show the effect of a change in product price or a shift in labor supply. Check [/ap-micro/unit-5](/ap-micro/unit-5) for FRQ practice sets tied to these topics.

### Where can I find AP Micro Unit 5 practice questions?

The best place to find AP Micro Unit 5 practice questions, including multiple-choice and practice test sets, is [/ap-micro/unit-5](/ap-micro/unit-5). There you'll find MCQs covering factor demand shifts, marginal revenue product calculations, and monopsony outcomes, plus FRQ practice that mirrors the format of the actual exam. Targeting questions by topic (5.1 through 5.4) helps you pinpoint which factor market concepts still need work.

### How should I study AP Micro Unit 5?

Start by building a clear understanding of how factor markets work: firms hire up to the point where marginal revenue product equals marginal resource cost. From there, work through each topic in order. For 5.1 and 5.2, practice drawing factor demand and supply graphs and listing what causes each curve to shift. For 5.3, drill the MRP = MRC hiring rule until it's automatic. For 5.4, compare monopsony outcomes (lower wages, fewer workers hired) to competitive markets on the same graph. Finish each study session with a few MCQs or a short FRQ to check your graph-drawing accuracy. Find topic-by-topic resources at [/ap-micro/unit-5](/ap-micro/unit-5).

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