Charlie is willing to pay $10 for a T-shirt that is priced at $9. If Charlie buys the T-shirt, then his consumer surplus is

As the stock of a depletable resource falls, its user cost

A) rises. B) falls. C) is unchanged, but its price rises. D) is unchanged, but the extraction cost rises. E) is unchanged, but its true cost rises.

The practice of charging customers different prices for the same good is called:

A. price marking. B. customer discrimination. C. group discounting. D. price discrimination.