本文利用兩期的耐久品模型，討論國外製造商對於代理通路的選擇以及其對本國代理商利潤、消費者福利與社會福利的影響。存在代理商的情況下Coase問題並不存在，且生產與行銷成本的高低，並不影響Coase問題是否存在；其次，對於同質產品，通路增加不一定能夠使製造商的利潤增加，須視消費國市場規模與製造商的生產成本而定；此外，通路代理商增加，對於地主國消費者福利與社會福利必定有所提升，但代理商的利潤會由於市場競爭較為激烈而下降；而國外製造廠商對於通路的選擇，亦受到生產與行銷成本的影響。

This study utilizes a two period model of durable goods to investigate how the foreign manufacturer chooses the retailing modes, and how this decision affects the domestic agent profit, the consumer welfare or the social welfare. Coase conjecture does not exist with the introduction of agents. Furthermore, neither the production nor the marketing cost affects Coase conjecture. Besides, the manufacturer profit of homogenous products is not necessarily increased by the expansion of retailer agents, which depends on the market scale of the consumer country and the manufacture's production cost. However, the increase of retailer agents definitely enhances the domestic consumer welfare and social welfare, but the agent profit shrinks due to fierce market competition. Therefore, retailing mode choice of the foreign manufacturer is pondering over the production cost and the marketing cost.