Introduction of Export Quota and Minimum Export Prices to Spatial Equilibrium Model of International Trade Under Tariff Quota System with Specific and Ad Valorem Duties : The Case of Perfectly Competitive and Oligopolistic International Trade

Shono and Kawaguchi (1999a, b) present spatial equilibrium models of both perfectly competitive and oligopolistic international trade under real tariff quota system with specific duties and ad valorem duties. But those models can not deal with export quota system and the minimum export prices system in international commodity agreement such as International Coffee Agreement. Also those models can not deal with oligopolistic international trade with two or more suppliers (firms) in each country. In this paper, we generalize those models to take export quota system and the minimum export prices system into consideration, and to take oligopolistic international trade with two or more suppliers (firms) in each country into consideration. Generalization for the minimum export prices system is made only for perfectly competitive case. We present simple examples of the generalized models, and solve the example problems to get equilibrium solutions. Implications of this paper and problems to be solved in the future are summarized in the last section of this paper