不完全竞争、非对称信息下的最优进口贸易政策和产业政策

本文讨论了不完全竞争和非对称信息情况下 ,如何运用进口贸易政策和产业政策增进本国福利的问题。本文发现 ,(1 )在Cournot同质产品竞争的情况下 ,制定可以诱使本国企业显示真实成本的政策规则可以实现与完全信息情况相同的配置结果 ;并且 ,本国企业的生产成本越低 ,政策规则规定的最优关税越低 ;在某些成本结构下 ,甚至应该执行零关税政策。 (2 )在圆形城市空间竞争 (SpatialCompetitioninCircularCity)的情况下 ,生产补贴和关税的作用完全等价 ;不存在可以实现事后效率的政策规则 ,并且 ,约束最优结果不是一个PBE均衡结果 ,本国政府的最优政策是制定等于单位运输成本的关税。上述结论蕴含 ,最优政策干预以及它能否消除非对称信息可能带来的效率损失依赖于竞争类型 ,而不依赖于信息结构 ,因此 ,它不会发生扭曲

Optimal Import and Industrial Policies under Imperfect Competition with Asymmetric Information

Optimal Import and industrial policies are derived in a world of imperfect competition with asymmetric information. The main findings are as follows. If duopolys play Cournot, the policy rule that could induce domestic firm to reveal its true type will implement the ex|post efficient outcome. However, if we consider spatial competition in circular|city, production subsidy is equivalent to tariff and we can not get first|best outcome. Indeed, the constant tariff equal to unit transportation cost is optimal. our results imply that optimal intervention and whether it can eliminate the efficiency loss for asymmetric information depend on the type of competition instead of the information structures, and it will not be distorted.