大国最优出口关税的计算——对现有文献中一个臆断的更正

A Calculation Method of Optimum Export Tariff for the Large Nations

在目前的国际贸易理论文献中,普遍有大国最优进口关税的计算公式及其证明,但却很少有大国最优出口关税的计算公式。在偶见载有大国最优出口关税的文献中,大国最优出口关税的计算公式却是根据大国最优进口关税公式推断出来的,没有经过严格的证明。本文根据通常的线性供给、需求函数假设,应用局部均衡方法,证明了大国最优出口关税的计算公式。本文的结果表明,现有文献中根据对称方法推断出来的大国最优出口关税公式是错误的。

There is seldom the formula of the optimum export tariff in a large nation in the present literature of international trade, but there is always the formula of the optimum import tariff in a large nation. The formula of the optimum export tariff in a large nation in few literature is deduced symmetrically by the formula of the optimum import tariff in a large nation, which is not proved strictly. This article has proved strictly the formula of the optimum export tariff in a large nation by the partial equilibrium and the usual supposition of linear supply and demand. The result of this article proves that the formula of the optimum export tariff in a large nation in the present literature, which is deduced symmetrically by the formula of the optimum import tariff in a large nation, is wrong.