Answer:
B. is the difference between the maximum amount a person is willing to pay for a good and its current market price.
Step-by-step explanation:
Consumer surplus is aeasure of customer benefits. It occurs when the price at which a consumer buys goods is less than what he was willing to pay. The extra money he was willing to pay is the surplus.
This concept is based on marginal utility (additional value a customer gets for consumption of extra unit of a good).
For Ecole if a customer is willing to pay $50 for a good whose market value is $30, the consumer surplus is $20.