IMPERFECT MARKET STRUCTURE AND INTERNATIONAL TRADE - SOME RECENT RESEARCH
综述了不完全竞争框架下贸易收益的三个潜在来源：自由贸易减少国内垄断扭曲、国际开放促进高效规模企业进入、以及增加产品种类。理论和实证研究表明贸易能改善配置效率和技术效率，并促进产品多样化。
In this paper, three aspects of the potential gains form trade in an imperfect competition framework are considered in the light of recent research: the presumption that free trade reduces the monopolistic distorsions of imperfect domestic markets; the role of international openness as a way of making room for more efficient-size sellers in the domestic market; its effect upon the appearance of new products and increase in the total number of products. Theoretical and empirical research suggest that trade is indeed likely to improve allocative as well as technical efficiency and often to promote more product varieties.