27. The optimum tariff is a. not practical for a small country due to the likelihood of retaliation. b. the tariff, which maximizes the difference between terms of trade gains and terms of trade loses. c. the best tariff a country can obtain via a WTO negotiated round of compromises. d. not practical for a large country due to the likelihood of retaliation. e. the tariff, which maximizes the terms of trade gains