寡头市场条件下的产品差异化及关税效应研究

在Dixit差异化双头垄断模型的框架内分析了产品差异化对关税政策效果的影响,同时研究了在古诺和贝特兰竞争条件下出口企业选择产品差异化战略的合理性.其推论表明:在古诺竞争前提下,产品差异化可以降低关税的利润转移效应;相反,在贝特兰竞争前提下,产品差异化使得最优关税相应提升.但是,无论在古诺还是贝特兰竞争条件下,产品差异化程度的提高均会导致出口利润的增长.

On the product differentiation and its effect to the tariff policy under oligopoly

The paper analyses the impact on the efficiency of tariff policy under the differentiated duopoly model of Dixit,and considers the rationality that the export firm chooses the strategy of the product diffferentiation under the Cournot and Bertrand competition.The propositions show that the product differentiation can lower the rent transfer efficiency by the tariff policy under the Cournot competition but can heighten the optimum tariff under the Bertrand competition.However,the increase of the extent of the product differentiation can raise the export revenue under both the Cournot and the Bertrand competition.