Measuring the Restrictiveness of Trade Policy
介绍贸易限制指数（TRI），即与给定贸易保护模式福利等价的统一关税，该指数有坚实的理论基础，能同时纳入关税和数量限制，并适用于个人电脑操作，对从事贸易政策实证研究的经济学者有参考价值。
This article provides an introduction to the trade restrictiveness index (TRI), which equals the uniform tariff that is welfare equivalent to a given pattern of trade protection. Unlike standard measures of trade restrictiveness, the TRI has a solid theoretical basis, can incorporate both tariffs and quantitative restrictions, and can be adapted to construct the trade policy equivalent of domestic distortions. The article compares a number of applications and describes procedures for operationalizing the TRI on a personal computer. The authors conclude that the TRI has considerable potential in empirical work.