Chapter 15 — Front Matter
Purpose and Overview
When you take a job, accept a wage, decide whether to pursue more education, or consider moving to a new city for work, you are participating in one of the most important markets in any economy: the labor market. Labor markets bring together workers who supply their time and skills and firms that demand those skills to produce goods and services.
Labor markets determine wages, employment levels, hours worked, and ultimately the income that households use to buy food, housing, education, healthcare, and everything else they need. Because labor income is the primary source of income for most households, understanding how labor markets work is essential to understanding inequality, poverty, economic growth, and public policy.
This chapter introduces the economic analysis of labor markets. You will learn why firms demand labor, what determines how much workers are paid, how labor supply and labor demand interact to set wages, and why wages differ so much across occupations, industries, and individuals. You will also examine the role of human capital, unions, minimum wage laws, and discrimination in shaping labor market outcomes.
Opening Question
Think about your own future career, or a job you already hold. Why does that job pay what it pays? Is it because of the skills it requires, the risks it carries, the location where it is performed, or something else entirely? By the end of this chapter, you will have the tools to analyze why wages differ — and why some of those differences are easy to explain, while others raise harder questions about fairness and discrimination.
10Sections
19Key Terms
3Graph Models
30Chapters Total
Learning Objectives
- 1Explain why labor is a factor of production and describe the structure of labor markets.
- 2Explain labor demand as derived demand and describe how marginal product and marginal revenue product determine hiring decisions.
- 3Explain labor supply as a tradeoff between work and other uses of time, and identify factors that shift labor supply.
- 4Determine equilibrium wage and employment using labor demand and labor supply, and analyze the effects of shifts in either curve.
- 5Define human capital and explain how education, training, and experience affect wages and productivity.
- 6Explain compensating differentials and why otherwise similar jobs can pay very different wages.
- 7Describe how unions engage in collective bargaining and analyze the effects of unions on wages and employment.
- 8Analyze the effects of a minimum wage in a competitive labor market and explain complications such as monopsony.
- 9Identify the major sources of wage differences across workers, including human capital, occupation, industry, geography, experience, and discrimination.
- 10Explain how labor market institutions — minimum wage laws, unions, anti-discrimination laws, and occupational licensing — shape labor market outcomes alongside supply and demand.
Sections 15.1 – 15.4
How Labor Markets Work
Labor as a Factor of Production · Labor Demand · Labor Supply · Equilibrium
Section 15.1
Labor as a Factor of Production
Every firm that produces something — a loaf of bread, a legal brief, a software application, a medical procedure — needs inputs. Economists group the inputs used in production into factors of production: land, labor, capital, and entrepreneurship.
Labor refers to the human work, effort, skills, and time that people contribute to production. Labor is unique among the factors of production because it is inseparable from the people who supply it. When a firm hires a worker, it does not simply purchase a quantity of hours. It enters into a relationship with a person who brings knowledge, effort, motivation, and judgment to the job.
Labor is used in virtually every stage of every production process. Farmers grow crops. Engineers design bridges. Teachers instruct students. Nurses care for patients. Even in highly automated industries, workers operate, maintain, program, and oversee machines.
Labor Markets
A labor market is a market in which workers sell their labor services and firms buy those services. Like other markets, labor markets have buyers and sellers, prices, and mechanisms of adjustment.
| Component | Description |
|---|
| Sellers | Workers — individuals who offer their time, effort, and skills in exchange for wages or salaries |
| Buyers | Firms — organizations that hire workers to produce goods and services |
| Price | The wage — the payment workers receive for their labor |
Labor markets exist at every level of aggregation: local labor markets (restaurant workers in a city), regional labor markets (construction workers in a state), national labor markets (physicians across a country), and global labor markets (software engineers across multiple countries).
Why Labor Market Analysis Matters
Labor income accounts for roughly 60 to 70 percent of national income in most advanced economies. Wages signal where labor is most valued, and labor market outcomes shape household well-being, poverty rates, inequality, and economic mobility. Policies such as minimum wages, occupational licensing, anti-discrimination laws, and job training are among the most debated and consequential economic policies.
- Identify the buyers, sellers, and price in the market for registered nurses in your region.
- Explain why labor is "inseparable from the people who supply it." How does this make labor markets different from markets for raw materials like steel or lumber?
- Give an example of a local labor market, a regional labor market, and a global labor market.
Section 15.2
Labor Demand
Firms demand labor not for its own sake but because labor helps them produce output. This is the key insight of derived demand: firms demand labor because they demand the output that labor helps produce. Labor demand is derived from the demand for the final good or service.
The Demand for Labor at the Firm Level
Each additional worker a firm hires produces additional output, called the marginal product of labor (MPL). As a firm hires more and more workers — holding other inputs like equipment and space constant — the marginal product of labor typically falls. This is the principle of diminishing marginal product.
Example 15.2.1
Diminishing marginal product at a pizza shop
| Workers Hired | Total Pizzas per Hour | Marginal Product of Labor |
|---|
| 0 | 0 | — |
| 1 | 8 | 8 |
| 2 | 14 | 6 |
| 3 | 18 | 4 |
| 4 | 20 | 2 |
| 5 | 20 | 0 |
Key takeaway: With one oven and limited counter space, each added worker contributes less than the one before — the kitchen gets crowded and the oven becomes a bottleneck.
From Marginal Product to Labor Demand
A firm hires workers to earn profit. The additional revenue generated by hiring one more worker is the marginal revenue product of labor (MRPL).
Key Formula
Marginal Revenue Product of Labor = Marginal Product of Labor × Output Price
A profit-maximizing firm hires workers up to the point where MRPL = Wage. The firm continues hiring as long as MRPL ≥ Wage and stops once MRPL < Wage.
If the wage is $15 per hour, the pizza shop hires workers whose marginal revenue product is at least $15. If the wage rises to $20 per hour, fewer workers meet that threshold and the firm demands fewer workers. This reasoning generates the law of labor demand: as the wage rises, the quantity of labor demanded falls; as the wage falls, the quantity of labor demanded rises — all else equal.
Graph 15.1 — The Labor Demand Curve
Wage
|
| *
| *
| * Labor Demand (LD)
| *
| *
+------------------------
Quantity of Labor
The labor demand curve slopes downward, reflecting the law of labor demand.
Shifts in Labor Demand
| Factor | Effect on Labor Demand |
|---|
| Changes in output demand | Higher consumer demand for the firm's product increases labor demand (shifts right); lower output demand shifts it left |
| Changes in worker productivity | Better technology, equipment, or training raises MRPL and increases labor demand |
| Changes in prices of other inputs | Cheaper machinery may reduce labor demand if labor and capital are substitutes; more machinery may increase labor demand if they are complements |
| Changes in the number of firms | More firms entering an industry increases total labor demand; firms exiting reduces it |
- Explain "derived demand" in your own words
- Why does MPL diminish as workers are added to fixed equipment?
- Calculate MRPL if MPL = 5 and price = $8
- Should a firm hire a worker if MRPL = $19 and wage = $21?
- Identify one factor that would shift labor demand right
- Identify one factor that would shift labor demand left
Section 15.3
Labor Supply
Workers decide how much labor to supply — how many hours to work, whether to take a job, and which jobs to accept — based on the tradeoff between work and other uses of their time.
The Individual Labor Supply Decision
When a worker decides how many hours to work, she weighs the benefit of working (the wage she earns) against the opportunity cost of working (the value of leisure time, household production, education, or other activities she gives up).
As wages rise, working becomes more attractive relative to leisure — the substitution effect. However, higher wages also make workers wealthier, which may cause some workers to want more leisure — the income effect. At very high wages, the income effect can outweigh the substitution effect, causing the labor supply curve to bend backward. For introductory purposes, this chapter focuses on the typical range where higher wages lead to a greater quantity of labor supplied.
Graph 15.2 — The Labor Supply Curve
Wage
| *
| *
| * Labor Supply (LS)
| *
| *
+------------------------
Quantity of Labor
The labor supply curve slopes upward in the typical range: as the wage rises, the quantity of labor supplied increases — the law of labor supply.
Shifts in Labor Supply
| Factor | Effect on Labor Supply |
|---|
| Working-age population | Population growth and immigration increase labor supply (shift right); a shrinking population shifts it left |
| Workforce participation | Childcare availability, education access, and changing norms can raise or lower participation rates |
| Alternative opportunities | More attractive jobs elsewhere reduce labor supply in a particular market |
| Non-wage income | Investment income, inheritance, or government transfers may reduce labor supply |
| Worker preferences | Changes in prestige, safety, or working conditions shift labor supply accordingly |
Common Misconception
Students sometimes assume the labor supply curve always slopes upward without limit. In reality, at very high wages some workers choose more leisure rather than more work — the labor supply curve can bend backward. This chapter focuses on the typical, more relevant range for most policy analysis.
- Explain the difference between the substitution effect and the income effect of a wage increase.
- What would cause the labor supply curve for nurses to shift right? Give two distinct examples.
- A wealthy individual inherits a large sum of money and decides to work fewer hours. Which effect does this illustrate?
Section 15.4
Wages and Equilibrium in Labor Markets
The equilibrium wage and equilibrium employment level are determined by the interaction of labor demand and labor supply. The equilibrium wage is the wage at which the quantity of labor demanded equals the quantity of labor supplied.
Graph 15.3 — Labor Market Equilibrium
Wage
| LS
| /
| /
| ----*---- Equilibrium (W*, L*)
| \
| \
| LD
+------------------------
Quantity of Labor
At the equilibrium wage (W*), the quantity of labor demanded equals the quantity of labor supplied at equilibrium employment (L*).
If the wage is above equilibrium, there is a surplus of labor: more workers want jobs than firms want to hire, which puts downward pressure on wages. If the wage is below equilibrium, there is a shortage of labor: firms want to hire more workers than are available, which puts upward pressure on wages. Adjustment can be slow and incomplete in practice, especially when wages are rigid downward, workers have limited mobility, or information is incomplete.
| Shift | Effect on Equilibrium Wage | Effect on Equilibrium Employment |
|---|
| Labor demand increases | Rises | Rises |
| Labor demand decreases | Falls | Falls |
| Labor supply increases | Falls | Rises |
| Labor supply decreases | Rises | Falls |
- A new factory opens in a small town, hiring 2,000 workers. Using a labor market diagram, explain what happens to the equilibrium wage and employment for workers with the relevant skills.
- A large local employer announces it will close. Predict the effect on the equilibrium wage and employment in that local labor market, and explain the adjustment process.
- Explain why a labor market with a wage above equilibrium tends to move toward equilibrium over time — and identify one real-world reason this adjustment might be slow.
Sections 15.5 – 15.7
Why Wages Differ: Skills and Job Characteristics
Human Capital · Education and Training · Compensating Differentials
Section 15.5
Human Capital and Productivity
Why do surgeons earn more than hospital orderlies? A major reason is human capital — the knowledge, skills, training, experience, and capabilities that workers accumulate through education, training, and experience. Human capital raises a worker's productivity: a more skilled worker produces more output per hour than a less skilled worker.
Human Capital Theory
Human capital theory, developed extensively by economist Gary Becker, treats education and training as investments. Just as a firm invests in physical capital to increase future output, individuals invest in human capital to increase their future earning power. Like any investment, this involves upfront costs (tuition, fees, forgone wages during school) and future benefits (higher wages earned over the working life).
| Type | Description | Who Typically Pays |
|---|
| General human capital | Skills valuable across many employers and industries — literacy, numeracy, communication, problem-solving, digital skills | Usually the worker (tuition, forgone wages) |
| Firm-specific human capital | Skills primarily valuable to a particular employer — knowledge of specific systems, processes, and culture | Often shared with the firm (training programs, on-the-job learning) |
Human Capital and the Wage Premium
Workers with more education earn higher wages on average — the education wage premium. Some of this reflects higher productivity. Some may reflect signaling: a degree may signal traits employers value, such as discipline and perseverance, even apart from any direct increase in productivity. In practice, both channels likely operate together.
- Explain why human capital is called an "investment." What are the upfront costs and future benefits?
- Classify each as general or firm-specific human capital: (a) learning a programming language used industry-wide; (b) learning a company's proprietary inventory software; (c) earning a certified public accountant license; (d) learning a specific manager's preferred meeting format.
- Explain the difference between the human capital and signaling explanations for the education wage premium.
Section 15.6
Education, Training, and Skills
Human capital is accumulated through multiple channels. Formal education — schools, colleges, vocational programs — is strongly correlated with wages, though the quality and content of education matter as much as the quantity, and unequal access to quality education contributes to wage inequality.
On-the-job training builds human capital outside the classroom. Formal on-the-job training includes apprenticeships, mentoring programs, and structured job rotations. Informal on-the-job training happens through learning by doing — workers become more productive simply by performing their jobs repeatedly and observing experienced colleagues.
Skill-Biased Technological Change
Technology has increased demand for workers with cognitive skills (analysis, problem-solving, creativity), technical skills (programming, data analysis, engineering), and interpersonal skills (collaboration, teaching, caregiving). At the same time, it has reduced demand for workers performing routine manual or routine cognitive tasks. This pattern is one reason wage inequality has grown in many countries over recent decades.
- Define apprenticeship
- Define learning by doing
- Name a cognitive skill in demand today
- Name a routine task at risk of automation
- Explain skill-biased technological change
- Identify one policy that could help displaced routine-task workers
Section 15.7
Compensating Differentials
Not all wage differences reflect differences in productivity or human capital. Some reflect differences in the attractiveness of the jobs themselves. Compensating differentials are wage differences that compensate workers for unpleasant, risky, or otherwise undesirable job characteristics.
| Job Characteristic | Example Occupations | Effect on Wage |
|---|
| Physical danger | Logging, commercial fishing, mining, roofing, firefighting | Premium for injury and death risk |
| Unhealthy conditions | Chemical exposure, dust, noise, extreme temperatures | Premium for disamenities |
| Unpleasant work | Sewer cleaning, meat processing, night shifts, isolated locations | Premium to attract workers |
| Irregular hours | Evening or weekend shifts, unpredictable schedules | Shift differentials and schedule premiums |
| Geographic isolation | Remote facilities, undesirable locations | Premium to attract workers |
Example 15.7.1
Comparing two otherwise similar jobs
- Job AFlexible remote work, pleasant conditions, regular daytime hours.
- Job BNight shifts at a remote facility with exposure to unpleasant conditions, similar skill requirements.
- PredictionIf Job B did not pay a wage premium, few workers would choose it over Job A.
- ConclusionThe wage premium Job B must pay to attract workers is the compensating differential — compensation for the difference in job attractiveness.
Key takeaway: Compensating differentials help explain wage variation among workers with similar skills and education.
The Reverse Case
Jobs with attractive characteristics — flexible hours, prestige, pleasant conditions, job security, desirable location — may pay less than productivity alone would predict, because workers accept a lower wage in exchange for these non-wage benefits.
- Identify a job in your community that likely pays a compensating differential. Explain which undesirable characteristic the wage premium compensates for.
- Identify a job that might pay less than productivity alone would predict because of attractive non-wage characteristics.
- Two workers have identical education. One works underground in a mine; the other works in an office. The miner earns more per hour. Explain why, using the concept of compensating differentials.
Sections 15.8 – 15.10
Institutions and the Distribution of Income
Unions and Collective Bargaining · Minimum Wages · Sources of Wage Differences
Section 15.8
Unions and Collective Bargaining
Individual workers typically negotiate wages with employers from a position of unequal power. Labor unions are organizations of workers that bargain collectively with employers over wages, benefits, and working conditions.
What Unions Do
Unions represent their members in collective bargaining over wages and wage increases; benefits such as health insurance and retirement plans; working conditions; job security; and grievance procedures. A successful negotiation produces a labor contract. If bargaining fails, unions may call a strike — the credible threat of which is itself a source of union bargaining power.
The Union Wage Premium
Where unions succeed in raising wages above the competitive equilibrium, unionized workers tend to earn higher wages than comparable non-union workers — commonly estimated at 10 to 20 percent in the United States. However, higher union wages may lead firms to hire fewer workers, and displaced workers seeking jobs elsewhere can push down wages in non-union sectors.
Unions also affect non-wage outcomes: some research finds unionized workplaces have lower turnover, better safety records, and more systematic grievance procedures. Union membership has declined significantly in many advanced economies — in the United States, from roughly 35 percent of workers in the mid-20th century to under 11 percent in recent years — due to structural shifts away from manufacturing, increased international competition, changes in labor law, and growth of non-standard work arrangements.
- List three things unions negotiate for besides base wages.
- Explain how a higher union wage in one sector could lower wages in a non-union sector.
- Identify two factors that have contributed to declining union membership in recent decades.
Section 15.9
Minimum Wages at an Introductory Level
A minimum wage is a legal floor on the wage that employers may pay workers. Their effects are among the most studied and debated topics in labor economics.
Graph 15.4 — Minimum Wage Above Equilibrium
Wage
| LS
| /
| --W_min------ Surplus (L_S - L_D)
| / \
| --W*---*------ Equilibrium
| / \
| / LD
+------------------------
L_D L* L_S
Quantity of Labor
At a minimum wage above equilibrium (W_min > W*), quantity demanded falls to L_D, quantity supplied rises to L_S, and a labor surplus (L_S − L_D) results.
In a simple competitive labor market, a minimum wage set above the equilibrium wage raises pay for workers who keep their jobs but reduces the quantity of labor demanded and increases the quantity supplied, creating a surplus of labor — unemployment among those who want jobs but cannot find them.
| Complication | Explanation |
|---|
| Monopsony power | If a local market has only one or a few employers, a minimum wage can raise both wages and employment by offsetting the employer's wage-setting power |
| Empirical findings | Many studies find little or no measurable employment decrease from moderate increases; others find modest negative effects, especially for younger or less experienced workers |
| Magnitude matters | A minimum wage modestly above the market wage likely has small employment effects; one set far above the market wage is more likely to cause significant unemployment |
Policy Debate, Not Settled Science
Minimum wage policy involves genuine tradeoffs between higher incomes for workers who retain employment and possible reduced employment opportunities for others. Careful economic analysis weighs both potential benefits and potential costs rather than assuming one outcome automatically dominates.
- In a competitive labor market, the equilibrium wage is $12 and equilibrium employment is 8,000. A minimum wage of $15 is enacted, reducing quantity demanded to 7,200 and raising quantity supplied to 8,900. Calculate the labor surplus.
- Explain how monopsony power changes the predicted effect of a minimum wage increase.
- Why might the same minimum wage increase have different employment effects in two different cities?
Section 15.10
Income Differences and Labor Market Institutions
Workers' wages and incomes differ enormously across the economy. Wage differences arise from several interacting factors: human capital differences, occupational differences and compensating differentials, industry differences, geographic differences, experience and tenure, and discrimination — paying workers differently based on characteristics unrelated to productivity.
The Gender Wage Gap
The gender wage gap describes the tendency for women to earn less than men on average. In the United States, full-time working women have historically earned roughly 80 to 85 cents for every dollar earned by full-time working men. Part of this gap reflects differences in education, occupation, industry, experience, and hours worked, and the gap has narrowed as women's educational attainment has risen.
A significant portion of the remaining gap is difficult to explain with observable worker characteristics. Contributing factors researchers study include occupational segregation, the "motherhood penalty," gender differences in wage negotiation, and continued unexplained differentials that may reflect discrimination.
The Role of Institutions
Labor market outcomes are shaped not only by supply and demand but also by institutions: minimum wage laws, collective bargaining and unions, anti-discrimination laws, occupational licensing, employment protection laws, and social insurance programs. These institutions interact with market forces to produce the outcomes we observe.
- List the six sources of wage differences introduced in this section and give one example of each.
- Explain why economists study "unexplained wage gaps" as evidence of potential discrimination, rather than treating the entire raw wage gap as discrimination.
- Name one labor market institution and explain how it shapes wages or employment differently than pure supply and demand would predict.
Chapter 15 — Back Matter
Chapter Summary
- Sec 15.1Labor markets bring together workers (sellers) and firms (buyers), with the wage as the price. Labor income makes up most national income and shapes household well-being.
- Sec 15.2Labor demand is derived from demand for output. Firms hire workers until MRPL equals the wage. Diminishing marginal product makes the labor demand curve slope downward. Output demand, productivity, input prices, and number of firms shift labor demand.
- Sec 15.3Workers supply labor by weighing wages against the opportunity cost of time. In the typical range, higher wages increase quantity of labor supplied. Population, participation, alternative opportunities, non-wage income, and preferences shift labor supply.
- Sec 15.4Equilibrium wage and employment occur where labor demand and supply intersect. Surpluses and shortages push wages toward equilibrium. Shifts in demand move wage and employment together; shifts in supply move them in opposite directions.
- Sec 15.5Human capital — education, training, experience — raises productivity and wages. General human capital is usually paid for by workers; firm-specific human capital costs are often shared with employers. The education wage premium reflects both productivity gains and signaling.
- Sec 15.6Human capital accumulates through formal education and on-the-job training. Skill-biased technological change has raised demand for cognitive, technical, and interpersonal skills while reducing demand for routine tasks, contributing to rising wage inequality.
- Sec 15.7Compensating differentials explain wage differences across jobs with similar skill requirements: dangerous, unpleasant, or inconvenient jobs pay premiums, while jobs with attractive non-wage features may pay less.
- Sec 15.8Unions bargain collectively over wages, benefits, and conditions. The union wage premium benefits members but may reduce employment among union workers or wages in non-union sectors. Union membership has declined substantially in recent decades.
- Sec 15.9In a competitive market, a minimum wage above equilibrium raises pay for employed workers but can create a labor surplus. Monopsony power complicates this analysis, and empirical evidence on employment effects is mixed and depends on the size of the increase.
- Sec 15.10Wage differences reflect human capital, occupation, industry, geography, experience, and discrimination. The gender wage gap has narrowed but an unexplained portion persists. Labor market institutions shape outcomes alongside supply and demand.
Key Terms Review
labor market
A market in which workers sell their labor services and firms buy those services, with wages as the price.
derived demand
Demand for a factor of production that arises from demand for the output that factor helps produce.
marginal product of labor (MPL)
The additional output produced by hiring one more worker, holding other inputs constant.
diminishing marginal product
The tendency for the marginal product of labor to fall as more workers are added to a fixed set of other inputs.
marginal revenue product of labor (MRPL)
The additional revenue a firm earns by hiring one more worker; equals MPL times output price for competitive firms.
labor demand curve
A curve showing the relationship between the wage and quantity of labor demanded; slopes downward.
labor supply curve
A curve showing the relationship between the wage and quantity of labor supplied; slopes upward in typical ranges.
equilibrium wage
The wage at which quantity of labor demanded equals quantity of labor supplied.
human capital
The knowledge, skills, training, and experience that raise a worker's productivity.
general human capital
Skills and knowledge valuable to many employers across industries.
firm-specific human capital
Skills and knowledge primarily valuable to a particular employer.
education wage premium
The difference in average wages between workers with more and less education.
compensating differentials
Wage differences that compensate workers for undesirable job characteristics such as risk or inconvenient schedules.
labor union
An organization of workers that bargains collectively with employers over wages, benefits, and conditions.
collective bargaining
Negotiation between a union and an employer over the terms of employment.
union wage premium
The wage advantage of unionized workers over comparable non-union workers.
minimum wage
A legal floor on the wage employers may pay workers.
monopsony
A labor market in which a single buyer (employer) has significant power over the wage.
gender wage gap
The observed difference in average wages between men and women.
Data Review
Table 15.1: Illustrative Wage Differences by Education Level (United States, approximate)
| Education Level | Median Weekly Earnings |
|---|
| Less than high school diploma | $620 |
| High school diploma, no college | $810 |
| Some college, no degree | $900 |
| Associate's degree | $960 |
| Bachelor's degree | $1,310 |
| Master's degree | $1,570 |
| Professional degree | $1,980 |
| Doctoral degree | $1,880 |
Note: Figures are illustrative and approximate. Actual wages vary by occupation, industry, location, and experience.
Table 15.2: Unemployment Rate by Education Level (United States, illustrative)
| Education Level | Approximate Unemployment Rate |
|---|
| Less than high school diploma | 5.5% |
| High school diploma, no college | 3.7% |
| Some college or associate's degree | 3.1% |
| Bachelor's degree or higher | 2.1% |
Note: Figures are illustrative. Actual rates vary with the business cycle and other conditions.
Worked Example Review
Worked Example 1
Finding the profit-maximizing employment level
- SituationA firm sells output for $4 per unit. The wage is $24 per hour.
| Workers | Total Output | Marginal Product | MRPL (× $4) |
|---|
| 0 | 0 | — | — |
| 1 | 10 | 10 | $40 |
| 2 | 18 | 8 | $32 |
| 3 | 24 | 6 | $24 |
| 4 | 28 | 4 | $16 |
| 5 | 30 | 2 | $8 |
Solution: Hire as long as MRPL ≥ $24. Workers 1–3 qualify ($40, $32, $24); workers 4–5 do not ($16, $8). The firm hires 3 workers. If the wage rose to $32, it would hire only 2; if the wage fell to $16, it would hire 4 — illustrating the downward-sloping labor demand curve.
Worked Example 2
Analyzing a minimum wage
- SituationEquilibrium wage for restaurant workers is $11/hour at 5,000 workers. A minimum wage of $15 is enacted.
- At $15/hourQuantity demanded falls to 4,200; quantity supplied rises to 5,500.
- SurplusLabor surplus = 5,500 − 4,200 = 1,300 workers
- Winners4,200 workers who keep or find jobs now earn $15 instead of $11 — a $4/hour increase.
- LosersUp to 800 workers who previously had jobs at $11 may lose employment; 1,300 workers who want jobs at $15 cannot find them.
Key insight: The net welfare effect depends on which is larger — the wage gain for employed workers or the employment loss for displaced workers. This is empirically contested and varies with how high the minimum wage is relative to the market wage.
Concept Check
- What does it mean that labor demand is "derived demand"?
- If a firm's MRPL is $18 per hour and the wage is $22 per hour, should the firm hire this worker? Explain.
- Why does the marginal product of labor typically diminish as more workers are hired to a fixed set of equipment and space?
- What would cause the labor supply curve for nurses to shift to the right?
- If a firm discovers a new technology that makes each worker 20 percent more productive, what happens to its labor demand curve?
- Give one example of a job that likely pays a compensating differential. Explain why.
- What is human capital? How does it differ from physical capital?
- In a simple competitive labor market, what happens to wages and employment if a minimum wage is set above the equilibrium wage?
Practice Questions
Questions 1–5: Vocabulary in Context
- A city's largest employer announces it will close its main factory. Using supply and demand analysis, explain what happens to the equilibrium wage and employment in the local labor market.
- Explain the difference between the marginal product of labor and the marginal revenue product of labor. Why is the distinction important for understanding labor demand?
- Two workers have the same years of education. One works at a coal mining operation underground; the other works at an office job. The miner earns more per hour. What economic concept explains this wage difference?
- A technology company begins offering a generous tuition reimbursement program for employees who pursue advanced degrees in relevant fields. Is this an investment in general human capital or firm-specific human capital? How would your answer affect whether the firm or the employee should bear the cost of this education?
- Explain why the union wage premium might lead to unemployment among union workers or pressure wages downward in non-union sectors.
Questions 6–10: Graph and Table Reasoning
- Draw a labor market diagram. Label the equilibrium wage and equilibrium employment. Show what happens to the equilibrium wage and employment if consumer demand for the firm's product rises significantly.
- Using Worked Example 1 as a model, suppose the output price rises from $4 to $5 per unit and the wage stays at $24. Reconstruct the MRPL column and determine the new profit-maximizing employment level.
- Using a labor market diagram, show and explain the effect of a minimum wage set below the equilibrium wage. Does it have any effect on wages or employment?
- The table below shows labor market data for a local service industry.
| Wage ($/hour) | Quantity Demanded | Quantity Supplied |
|---|
| $10 | 8,000 | 4,000 |
| $12 | 7,000 | 5,500 |
| $14 | 6,000 | 6,000 |
| $16 | 5,000 | 7,000 |
| $18 | 4,000 | 8,500 |
a. What is the equilibrium wage and equilibrium employment?
b. If a minimum wage of $16 is set, what is the labor surplus?
c. If a minimum wage of $12 is set, does it have any effect?
- Using the wage-by-education data in Table 15.1, calculate the approximate percentage wage premium earned by bachelor's degree holders compared to high school diploma holders. Show your calculation.
Economic Reasoning Questions
- A student is deciding whether to pursue a two-year associate's degree in medical imaging technology or enter the workforce immediately after high school. Apply human capital theory to explain how an economist would think about this decision. What information would be most important for making the decision?
- A city raises its minimum wage from $12 to $17 per hour. Economists study the local restaurant industry and find that employment fell by only 1 percent — much less than a simple supply-and-demand model would predict. What explanations might account for this smaller-than-expected employment effect?
- Explain how skill-biased technological change could increase wage inequality even if no discrimination is occurring and all workers are paid their marginal revenue product.
- A firm opens a new facility in a rural area where there are few employers. The firm pays wages well below what similar workers earn in the nearest city. Analyze this situation. What labor market concept might explain why workers accept these wages? What might cause wages to rise over time?
- Two workers with identical resumes, education, and experience apply for the same job. One is offered the position at $62,000 per year; the other is told the position is no longer available but is later found to have been filled at the same salary. If this reflects discrimination, explain the economic costs — not just the moral problem — of labor market discrimination. Who is harmed?
Policy Scenario Questions
Scenario 1
Minimum Wage Increase
A state legislature is debating whether to raise the state minimum wage from $10 per hour to $15 per hour. The current federal minimum wage is $7.25 per hour.
- Identify the economic groups likely to benefit from this increase.
- Identify the economic groups likely to be harmed.
- What information would you want to know before deciding whether to support or oppose the increase?
- Is the minimum wage debate primarily a question of positive economics or normative economics? Explain.
Scenario 2
Occupational Licensing
A state requires cosmetologists to complete 1,500 hours of training before receiving a license to work. A barber's license requires 1,200 hours. Critics argue these requirements are excessive and raise the price of haircuts while reducing competition. Supporters argue training protects public safety and ensures quality.
- How does occupational licensing affect the supply of licensed workers in the cosmetology labor market?
- How does it affect wages in that labor market?
- Who benefits from licensing requirements, and who bears the costs?
- How would an economist evaluate whether a particular licensing requirement is economically justified?
Error Analysis
Each statement contains an economic error. Identify and correct the error.
- "Because the minimum wage increases labor supply, it creates unemployment."
- "A firm should keep hiring workers as long as total output is rising."
- "Human capital is the machines and equipment that workers use on the job."
- "If the labor supply curve shifts right, wages must rise because more workers are available."
- "Unions benefit all workers in an economy by raising wages across the board."
- "Compensating differentials mean that all jobs eventually pay the same wage once you account for their different characteristics."
Real-World Applications
- Automation and labor demand. Some economists argue that advances in artificial intelligence and robotics could displace millions of workers in transportation, manufacturing, and services. Using labor demand analysis, explain how automation affects the labor market in the short run and what adjustments might occur in the long run.
- Immigration and wages. Critics of immigration argue that more immigrant workers reduce wages for native-born workers. Supporters argue immigrants fill labor shortages and increase economic output. Using labor supply and demand, analyze both arguments. Under what conditions would each argument be more valid?
- The gig economy. Platforms like rideshare and delivery apps use independent contractors rather than employees. These workers often lack benefits like health insurance, retirement contributions, and unemployment insurance coverage. What labor market concepts help explain the growth of gig work? What tradeoffs do gig workers face compared to traditional employees?
- The teacher shortage. Many school districts report difficulty filling teaching positions, especially in math, science, and special education. Using labor market analysis, identify possible explanations for teacher shortages and evaluate possible policy responses.
- International wage differences. Wages for similar work differ enormously across countries — a software developer might earn far more in one country than in another with similar educational levels. What economic factors explain international wage differences? How might these differences change as economies develop?
Mixed Review
- (Chapter 3) A factory worker considers quitting her job to attend a two-year nursing program. Identify the opportunity costs of her decision. Are tuition costs the largest opportunity cost?
- (Chapter 8) The equilibrium wage for entry-level retail workers in a city is $13 per hour. The city enacts a minimum wage of $16 per hour. Draw the resulting labor market diagram and identify the areas representing workers who are better off, workers who are worse off, and the labor surplus.
- (Chapter 9) The wage elasticity of labor demand in the fast-food industry is estimated at −0.7. If wages rise by 10 percent, by what percentage does the quantity of labor demanded change? Is labor demand elastic or inelastic in this case? What does this imply about the employment effects of a minimum wage increase?
- (Chapter 14) A corporation employs nearly all workers in a small rural town and is the primary employer in the region. This is called a monopsony. Explain how this market power affects the wage the firm pays relative to the competitive wage. How might a minimum wage affect employment in this case differently than in a competitive labor market?
- (Chapter 19) Research shows that workers without a high school diploma have significantly higher poverty rates than workers with a bachelor's degree. Using labor market concepts from this chapter, explain the economic mechanisms connecting education to poverty risk.
Chapter 15 Checkpoint
Chapter 15 Checkpoint
Labor Markets, Wages, and Income — Complete without assistance; assesses all key skills and concepts from Chapter 15
Section 1 — Vocabulary and Concepts
- Define "derived demand" and explain why labor demand is an example of it.
- What is the difference between the marginal product of labor and the marginal revenue product of labor?
- Explain the substitution effect and income effect of a wage increase on labor supply.
- What is human capital? Give two examples of how workers acquire it.
Section 2 — Graph and Calculation Practice
- A firm sells output at $6 per unit and pays a wage of $30 per hour. The marginal product of the third worker is 6 units. Calculate the marginal revenue product of the third worker and state whether the firm should hire that worker.
- Draw a labor market diagram showing equilibrium wage and employment. Then show the effect of a minimum wage set above equilibrium, labeling the resulting surplus.
Section 3 — Analysis
- Explain why two workers with identical education can earn very different wages due to compensating differentials. Give a specific example.
- A student says: "Unions always make all workers in the economy better off." Is this correct? Explain why or why not using concepts from this chapter.
Section 4 — Applied Practice
- Identify an occupation you are interested in. Explain: (a) what human capital it requires; (b) whether it likely involves a compensating differential and why; (c) whether wages in that occupation are more likely shaped by unions, minimum wage laws, or neither.
- Describe a labor market institution discussed in this chapter and explain how removing it would likely change wages or employment in a specific market.
Section 5 — Evidence and Discrimination
- Explain the difference between the raw gender wage gap and the "unexplained" portion of the gap that remains after controlling for education, experience, occupation, and hours. Why does this distinction matter for evaluating claims about discrimination?
Looking Ahead
Chapter 16: Externalities and Public Goods
Chapter 15 explored how labor markets work — how wages are determined, why they differ across workers and occupations, and how institutions like unions and minimum wages shape outcomes. These insights focused on well-functioning labor markets. Chapter 16 turns to situations where markets may not produce efficient or socially desirable outcomes — market failures. The chapter introduces externalities (costs or benefits that fall on parties outside a market transaction) and public goods (goods that markets tend to underprovide because individuals cannot be excluded from using them). Understanding when and why markets fail, and how policy might respond, is one of the most important applications of microeconomic reasoning.
MGU Library Connection
- Labor Market Graph Reference — Appendix C of this textbook
- Formula and Calculation Reference (MRPL, wage formulas) — Appendix E of this textbook
- Chapter 9: Elasticity — develops elasticity reasoning used in Mixed Review Question 3
- Chapter 16: Externalities and Public Goods — continues directly from this chapter's market analysis
- Chapter 19: Poverty, Inequality, and Economic Mobility — develops income distribution concepts introduced here
- Economics Vocabulary Guide — Companion Resource