讲座题目：Multipurchasing with Complementarity and Full Market Covering   带有互补性的多重购买与全市场覆盖

主讲人：LEE, JONG JAE 韩国天主教大学 讲师

讲座时间：2023年6月26日9:00-10:10

讲座地点：经管院C366

讲座内容摘要：

This paper studies implications of complementarity and full market covering property on the existence of multi-purchase equilibrium in the variant of the Hotelling model that allows for an outside option of“no purchase”and a multi-purchasing option of buying both products from different firms. We show that when goods are complements, a multi-purchase equilibrium is a unique equilibrium in which every consumer buys at least one product. Particularly, we show that the set of prices supporting full market covering implies multi-purchasing however large is the value of product for consumers. This provides a cautionary warning to an understanding that full market covering assumption is innocuous because market can be made fully covered if the value of product is sufficiently large.

本文研究互补性和全市场覆盖属性对多重购买均衡存在性的影响。在Hotelling模型的变体中，该模型允许有“不购买”的外部选择以及从不同公司购买两种产品的多重购买选项。我们证明，当商品是互补的时候，多重购买均衡是唯一的均衡，其中每个消费者至少购买一种产品。特别地，我们表明，支持全市场覆盖的价格集合意味着多重购买，无论消费者对产品的价值有多大。这对于认为全市场覆盖假设是无害的观点提供了一个警示，因为只要产品的价值足够大，市场就可以被完全覆盖。

主讲人个人信息：

Lee Jong Jae is a lecturer at The Catholic University of Korea. He got hisPh.D.in Economics from Johns Hopkins University and worked asan Assistant Professorat the Economics and Management School of Wuhan University from 2018 to 2022. His research areas include mathematical economics, bargaining, applied IO theory, etc., and published scientific outputs in several international academic journals such as Economic Theory, Journal of Economic Theory, Mathematical Social Sciences.

李锺在现任韩国天主教大学讲师。他在美国约翰霍普金斯大学获得经济学博士学位，并于2018年至2022年期间担任44118太阳成城集团的助理教授、特聘副研究员。他的研究领域包括数理经济学、议价、应用产业组织理论等，并在《经济理论》、《经济理论杂志》、《数理社会科学》等多个国际学术期刊上发表了科研成果。

（1）教育/职业经历: Ph.D.in Economics at Johns Hopkins University / Worked at Economics and Management School of Wuhan University (2018-2022)

（2）研究领域:Mathematical Economics, Bargaining, Applied IO Theory

（3）学术成果: Economic Theory, Journal of Economic Theory, Mathematical Social Sciences.