A wage change creates substitution and income effects in labor supply
The income effect can bend individual labor supply backward.
A higher wage raises the opportunity cost of leisure, creating a substitution effect toward more work. It also raises income for a given number of hours. If leisure is normal, the income effect encourages more leisure and less work. At lower wages substitution often dominates. At high wages a strong income effect can produce a backward-bending individual labor-supply curve.
Treat a person’s fixed time as a budget. Each hour of leisure costs the wage that could have been earned. A higher wage therefore makes leisure relatively more expensive, so substitution moves away from leisure and toward labor. At the same time, the person can reach a target income with fewer work hours, and greater purchasing power can increase demand for normal leisure. The two effects oppose one another.
If substitution dominates, hours worked rise with the wage and the labor-supply curve slopes upward. If the income effect dominates at a high wage, hours worked fall as the wage rises, producing the backward-bending segment. The wage at which dominance changes is not universal. It depends on preferences, obligations, and the range considered.
A raise with fewer hours
A consultant’s wage rises from $60 to $90 per hour. The higher opportunity cost of leisure favors more work, but the consultant chooses to preserve a desired annual income and take more time off. Hours fall because the income effect dominates. This does not mean the substitution effect reversed. It means the opposing income effect was larger.
Do not transfer this result automatically to the market labor-supply curve. A market includes many workers entering, exiting, changing occupations, and responding differently. The exam may test the individual mechanism without claiming that total market labor supply bends backward.
Market supply can rise even if some high-wage individuals reduce hours. Higher wages can attract new workers, encourage occupational switching, delay retirement, or draw labor from other regions. Summing heterogeneous individual responses need not preserve the backward bend of one person’s curve.
Nonlabor income creates a related test. If a person receives additional wealth with the wage unchanged and leisure is normal, the income effect predicts more leisure and fewer work hours. There is no substitution effect because the relative price of leisure did not change. This cleanly separates the two channels.
| Change | Substitution effect | Income effect if leisure is normal |
|---|---|---|
| Wage rises | More work, less leisure | Less work, more leisure |
| Wage falls | Less work, more leisure | More work, less leisure |
| Nonlabor income rises | None | Less work, more leisure |
On an economics exam item, identify whether the question concerns one worker or the entire labor market. Then state both effects before selecting the net response. If the relative strengths are not supplied, the direction of individual hours may be indeterminate even though the substitution direction is known.
Keep the effects conceptual
Substitution is about relative price. Income is about purchasing power. “The consumer has more money left” describes the income effect. “the good is cheaper than alternatives” describes substitution.
Always identify the person-level choice before applying this decomposition to observed market employment.
An individual labor-supply curve may bend backward at high wages when
- the substitution effect always exceeds the income effect
- leisure becomes an inferior good
- the wage no longer measures opportunity cost
- the income effect toward leisure is stronger
- employers acquire monopsony power
the income effect toward leisure is stronger At sufficiently high wages, the desire to purchase more leisure with higher income can outweigh the substitution effect and reduce hours worked.
When a wage increase causes a worker to choose fewer hours, the most direct explanation is that
- labor demand became more elastic than labor supply
- leisure became inferior as real income rose
- there was no substitution effect toward work
- the income effect toward leisure was stronger
- the opportunity cost of an hour of leisure fell
the income effect toward leisure was stronger A higher wage makes leisure more costly, but it also raises real income. Hours fall only when the income effect favoring leisure is stronger.
When the wage rises, the substitution effect in labor supply tends to
- increase work as leisure becomes more costly
- decrease hours worked because income rises
- reduce the opportunity cost of leisure
- shift labor demand right
- leave hours unchanged
increase work as leisure becomes more costly A higher wage raises the forgone earnings from an hour of leisure, so substitution favors more work and less leisure.
Watch the idea in action
A focused video lesson from Economics in Many Lessons.
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