Suppose the figure below shows the demand curve, marginal revenue curve and marginal cost curve for a monopolist.  The socially optimal level of output is ________ units per day.

Wendell can sell five motor homes per week at a price of $22,000. If he lowers the price of motor homes to $20,000 per week he will sell six motor homes. What is the marginal revenue of the sixth motor home?

A) $10,000 B) $12,000 C) $20,000 D) $22,000

A decrease in demand means that quantity demanded falls

A. at least one price. B. at a few prices. C. at most prices. D. at all prices.