The difference between the willingness to pay for a good and the price that is paid to get it is

a. welfare economics.
b. willingness to sell.
c. producer surplus.
d. consumer surplus.

Consumer surplus

Explanation:

The consumer surplus is a measure of the difference between the price a consumer is willing to pay for a unit of a product and the price they actually pay for that product unit.

If a consumer is willing to to pay a higher amount than the actual selling price of a product, it is deduced that the consumer surplus for that product, is higher than if the consumer were charged for the product at his highest willingness point to pay.

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i don't know if this is exactly what your looking for but i hope this !