A decrease in government purchases can close an expansionary gap by shifting the aggregate demand curve

What does willingness to pay measure?

a) the amount a buyer is willing to pay for a good minus the amount the buyer actually pays for it b) the amount a seller actually receives for a good minus the minimum amount the seller is willing to accept c) the maximum amount a buyer is willing to pay minus the minimum amount a seller is willing to accept d) the maximum amount that a buyer will pay for a good

A single-price monopoly has marginal revenue and marginal cost equal to $19 at 15 units of output where the price on the demand curve is $38. What is the firm's total revenue?

A) $38 B) $285 C) $570 D) $19 E) There is not enough information given to answer the question.