if the united states raised its tariff on tires, then at the original exchange rate there would be a a. surplus in the market for foreign-currency exchange, so the real exchange rate would appreciate. b. shortage in the market for foreign-currency exchange, so the real exchange rate would depreciate. c. shortage in the market for foreign-currency exchange, so the real exchange rate would appreciate. d. surplus in the market for foreign-currency exchange, so the real exchange rate would depreciate.