If total revenue falls when output increases, marginal revenue is

Which of the following statements is correct?

I. The Fed can periodically and without warning examine member commercial banks to ensure that they are conforming to current banking standards. II. The Fed helps the government collect certain tax revenues and aids in the purchase and sale of government securities. A) I only B) II only C) Both I and II D) Neither I nor II

The main reason(s) monopolies can earn positive profits for a while is(are)

a. assets cannot quickly move in and out of the industry when demand fluctuates b. an increase in demand does not lead to entry of firms to absorb the extra demand c. both A&B d. none of the above