A. Briefly describe the impact of a tariff on the welfare of consumers, producers, and the nation in the case of a small country and perfect competition.

B. Briefly describe the impact of a tariff on the welfare of consumers, producers, and the nation in the case of a large country and perfect competition.

C. Briefly describe the impact of export subsidy on the welfare of consumers, producers, and the nation in the case of a small country and perfect competition.

D. Briefly describe the impact of export subsidy on the welfare of consumers, producers, and the nation in the case of a large country and perfect competition.

E. Briefly describe the impact of export taxes on the welfare of consumers, producers, and the nation in the case of a small country and perfect competition.

F. Briefly describe the impact of export taxes on the welfare of consumers, producers, and the nation in the case of a large country and perfect competition.