This paper characterizes the optimal reciprocal trade policy in the environment of Melitz (2003) with firm productivity heterogeneity. In particular. without making parametric assumptions on firm productivity distribution. this paper derives the optimal degree of reciprocal tariff reductions that maximize the world welfare. https://www.soiebiologique.com/quick-sale-Axol-Friends-Mel-Axol-the-Axolotl-Black-Purple-special-save/