Suppose the U.S. and Japan are the only two countries in the world. What will happen to the value of the U.S. dollar (appreciates or depreciates), and the U.S. exports, as the result of the following events (other things equal)?

a. The United States imposes import tariffs on many Japanese goods.

b. Interest rates on savings bonds in the United States fall relative to Japanese savings bonds. (4 points)