Competitive wage comes from market supply and demand
One employer then faces a horizontal labor supply at that wage.
Demand for the service produced by an occupation increases while worker productivity and labor supply are unchanged. The competitive labor market will most likely experience
- a rightward labor-demand shift, raising wage and employment
- a movement down labor demand, lowering wage
- a rightward labor-supply shift, lowering wage
- a lower MRP at every employment level
- no change because the workers’ physical output is unchanged
a rightward labor-demand shift, raising wage and employment Stronger product demand raises the revenue created by workers and shifts market labor demand right, increasing both equilibrium wage and employment when labor supply is upward sloping.
Two jobs require the same skill, but one involves substantially greater injury risk. A persistent wage premium for the risky job is best explained by
- a compensating wage differential
- diminishing marginal product
- a perfectly elastic product demand
- a binding wage ceiling
- economic rent from land
a compensating wage differential The higher wage compensates workers for an undesirable nonwage job characteristic rather than proving higher productivity.
In a competitive labor market, the equilibrium wage occurs where
- each worker’s MRP equals average product
- the minimum wage equals the market wage
- one firm’s labor demand meets its labor supply
- market labor demand intersects market labor supply
- all workers earn the same wage in every occupation
market labor demand intersects market labor supply The market wage balances the total quantity of labor employers want to hire with the quantity workers want to supply.
Watch the idea in action
A focused video lesson from Bank of Canada – Banque du Canada.
1. Set the market wage, then choose one firm’s employment
The market graph determines wage and total employment. A small competitive employer takes that wage as given and hires on its own marginal revenue product schedule.
Market labor demand is the horizontal sum of firms’ MRP schedules. Market labor supply reflects workers’ opportunity cost of time and job alternatives. Equilibrium wage makes labor supplied equal labor demanded. A small firm hires where its MRP equals the market wage.
The labor market and one employer require separate graphs. Market labor demand sums employers’ MRP schedules. Market labor supply sums workers’ willingness to offer labor at different wages. Their intersection sets the competitive wage and total employment. One small employer then faces a horizontal labor supply at that wage and hires where MRP=w.
Labor supply reflects opportunity cost. A higher wage can draw people from leisure, another occupation, another location, or nonparticipation. A change in wage produces movement along supply. Population, migration, training, preferences, nonlabor income, or opportunities in other labor markets can shift the curve.
2. Separate movements from labor-market shifts
A wage change moves the market along labor demand and supply. Product value, productivity, workforce conditions, and alternatives can shift an entire curve.
| Event | Curve and direction | Immediate logic |
|---|---|---|
| Output demand rises | Labor demand right | Worker output is worth more |
| Immigration expands eligible workforce | Labor supply right | More workers at each wage |
| Training raises productivity | Labor demand right | MRP rises |
| Alternative occupation wage rises | Focal labor supply left | Workers switch away |
| Nonlabor income rises. Leisure normal | Labor supply may shift left | Workers desire more leisure |
3. Explain wage differences with evidence
A wage gap can reflect productivity, job conditions, institutions, discrimination, or market power. The observed gap alone does not identify its cause.
Wage differences need not prove discrimination or productivity differences alone. Human capital can raise MP. Risk, night work, isolation, or unpleasant conditions can require compensating differentials. Licensing or unions can affect supply and bargaining. Employer or employee market power can affect the wage-setting process. The stem should identify the mechanism.
A compensating differential
Two jobs require the same skill and produce the same value, but one involves dangerous overnight work. If workers dislike the risk and schedule, that job may need a higher wage to attract an equal quantity of labor. The gap compensates for a nonwage disadvantage. It is not evidence that those workers are more productive.
Human capital is education, training, experience, and health that raise productive ability. A productivity increase shifts labor demand, while the cost of acquiring training can also influence labor supply to an occupation. Keep the side of the market explicit.
At equilibrium, wage is not necessarily equal across all occupations because job attributes, skills, locations, and barriers differ. The competitive model predicts equality for comparable workers and conditions after adjustment, not a single wage for every kind of labor.
When a market wage changes, one small employer moves along MRP. When product demand changes for all employers, market labor demand shifts and the equilibrium wage changes. Use the market graph first, then the firm graph, just as with competitive product markets.
Reza is an experienced Math instructor and a test-prep expert who has been tutoring students since 2008. He has helped many students raise their standardized test scores--and attend the colleges of their dreams. He works with students individually and in group settings, he tutors both live and online Math courses and the Math portion of standardized tests. He provides an individualized custom learning plan and the personalized attention that makes a difference in how students view math.
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