大陆成人直播

主讲人：Ken Kikkawa，University of British Columbia

题目：Concentration and Markups in International Trade

参与老师：余昌华、薛思帆、赵波、李明浩、李林橦、莫家伟

时间：2025年9月26日（周五）上午10:30-12:00（北京时间）

地点：345教室

摘要：

This paper derives a closed-form expression linking aggregate markups on imported inputs to concentration in a model of firm-to-firm trade with two-sided market power. Our theory extends standard oligopoly insights in two dimensions. First, it reveals that markups increase with exporter concentration and decrease with importer concentration, reflecting the balance of oligopoly and oligopsony forces. Second, it adapts conventional market definitions to reflect rigid trading relationships, yielding new concentration measures that capture competition in firm-to-firm trade. Analysis of Colombian transaction-level import data shows these differences are key to understanding markup dynamics in international trade.

主讲人介绍：

Ken Kikkawa is an Assistant Professor at the University of British Columbia Sauder School of Business. He has earned a Ph.D. in Economics from the University of Chicago in 2018. Dr. Kikkawa’s research focuses on trade between firms, using detailed micro data on firms and networks from multiple countries. His research has been published in top outlets such as the Journal of International Economics, Journal of the European Economic Association, and the Review of Economic Studies.