Questions: Wage Determination and Labor Market Equilibrium

Question 1

A new technology doubles the output per farm worker who uses it. Holding all else equal, what happens in the labor market for these workers?

• A. Nothing in the short run — wages only change when the number of workers changes
• B. The labor demand curve shifts right, raising both the equilibrium wage and the quantity of labor employed
• C. Individual wages rise as workers move up the existing demand curve to a higher wage
• D. Labor supply shifts left as workers choose more leisure because they can earn the same income with less effort

Answer: (B)

Higher worker productivity raises MRPL (marginal revenue product of labor). Since the labor demand curve IS the MRPL curve, improved productivity shifts the entire demand curve rightward — at every wage, firms now want to hire more workers. The new equilibrium has a higher wage and higher employment. This is a shift of the curve (due to a non-wage factor), not a movement along it.

Question 2

Deep-sea oil rig workers earn substantially more than comparable workers doing equivalent tasks onshore. The most likely economic explanation is:

• A. Offshore workers have more years of education and human capital investment
• B. A compensating wage differential for the dangerous, remote, and uncomfortable working conditions
• C. Oil companies discriminate in favor of workers willing to go offshore, bidding up their wages
• D. Offshore workers have higher MRPL because oil extracted at sea is priced higher than onshore oil

Answer: (B)

Compensating differentials are wage premiums paid to attract workers to jobs with undesirable non-wage characteristics — danger, remoteness, irregular hours, poor conditions. Deep-sea rigs are physically dangerous, isolated, and involve long shifts away from family. To fill these positions with workers who could otherwise find comparable onshore work, firms must pay a premium. This is a compensating differential, not a productivity or discrimination story.

Question 3

In a competitive labor market, if all workers suddenly become twice as productive due to a new technology adopted across all firms, wages will rise.

• T. True
• F. False

Answer: True

Higher productivity raises MRPL for all workers. Labor demand shifts right (firms want more workers at every wage because each worker now generates more revenue). With labor supply unchanged, the new equilibrium wage is higher. This is the fundamental link between productivity and wages in competitive markets.

Question 4

In labor market theory, wages typically and mainly reflect a worker's marginal revenue product — other factors cannot cause wages to deviate from MRPL.

• T. True
• F. False

Answer: False

Wages can deviate from MRPL for several reasons. Compensating differentials add a premium for unpleasant jobs (wages exceed MRPL of a reference worker). Discrimination can depress wages below MRPL for affected groups. Human capital investment can raise MRPL, creating a positive gap between educated and uneducated workers doing similar tasks. The w = MRPL condition is the competitive ideal, not a universal law.

Question 5

Why does the labor demand curve slope downward, and exactly where does a profit-maximizing firm choose to operate on it?

Model answer: The labor demand curve is the MRPL curve. Due to diminishing marginal returns, each additional worker adds less output (and thus less revenue) than the one before. So MRPL falls as employment increases, giving the demand curve its downward slope. A profit-maximizing firm hires up to the point where wage = MRPL: as long as the next worker generates more revenue than they cost, it pays to hire them; once MRPL falls to the wage level, hiring stops.

The w = MRPL hiring rule is the labor market equivalent of P = MC in product markets — both are marginal conditions for profit maximization. Understanding why the curve slopes down (diminishing returns) and why firms stop at w = MRPL (marginal cost = marginal benefit) gives the full picture of labor demand.