# Consumer Surplus

Consumer Surplus sums the dollar amount consumers are willing to pay and subtracts the price they pay.

## Example

The inverse demand for bananas is P = 5 - 0.5 Q_d.

A banana is sold \\$1. Consumers will demand Q_d = 10 - 2 \times 1 = 8 bananas.

The Consumer Surplus is \text{CS} = \frac{\left( 5 - 1 \right) \times \left( 8 \right)}{2} = \frac{4 \times 8}{2} = 16.

### Question

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