Example

Student's Optimal Choice After a Wage Increase

When a student's wage increases, for example from $90 to $130 per day, their budget constraint becomes steeper, reflecting the higher opportunity cost of free time. The constraint pivots outward around the point of maximum free time (e.g., 70 days, $0 consumption), which expands the feasible set of consumption and leisure combinations. This expansion allows the student to reach a higher indifference curve, signifying greater utility. The new optimal choice is found at the tangency point on this new budget constraint, such as point D, which might correspond to 30 days of free time and $5,200 in consumption.

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Updated 2026-05-02

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