11-1
Consumer Surplus When the Price of a Used Textbook = $30
| Potential buyer | Willingness to pay | Price paid | Individual consumer surplus = Willingness to pay − Price paid |
| Aleisha | $59 | $30 | $29 |
| Brad | 45 | 30 | 15 |
| Claudia | 35 | 30 | 5 |
| Darren | 25 | — | — |
| Edwina | 10 | — | — |
| All buyers | Total consumer surplus = $49 |
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