In the 1960s, the United States had ______ incentives for firms to reduce air pollution.

In an oligopoly market, there is (are) ________ seller(s)

A) one B) a few C) many D) very many

How will an interest rate increase in the United States affect equilibrium in the market for dollars against foreign currencies? (Assume the exchange rate is stated in terms of foreign currency per U.S. dollar.)

A) The equilibrium exchange rate will increase, and the equilibrium quantity of dollars traded will increase. B) The equilibrium exchange rate will decrease, and the equilibrium quantity of dollars traded cannot be determined. C) The equilibrium exchange rate cannot be determined, and the equilibrium quantity of dollars traded will increase. D) The equilibrium exchange rate will increase, and the equilibrium quantity of dollars traded cannot be determined.