Many students have jobs while they go to school. Suppose, you work part time earning $10 per hour, working 10 hours a week. Now suppose, you could work more hours but choose not to. What if you were offered $20 per hour, would you work more hours per week? How about $50 per hour or $100 per hour? If you choose not to work now, what rate would be high enough to change your mind? At a high enough wage, you'd probably be willing to drop out of school to work full time. If, as the wage you could earn increases so would the hours you supply, the result is an upward sloping supply curve.

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