研討日期	2021年9月6日上午10:30~ 12:20
研討地點	國立臺灣大學710 討論室
主講題目 Title of the paper	Free Entry Under Common Ownership
作者 Authors of the paper	Susumu Sato, Toshihiro Matsumura
文獻出處 Journal, vol.(issue), pp	Economics Letters 195 (2020) 109489
主講人	陳彥勲
參加人員	陳彥勲、王光正、林燕淑、施姵全、梁文榮、張瑞雲、黃鴻、郭文忠、Dong Van Chung、林晏如、Beny Trias Oktora、許至乙
摘要 Abstract of the paper	This study investigates the equilibrium and welfare properties of free entry under common ownership. We formulate a model in which incumbents under common ownership choose whether to enter a new market. Using a circular-market model, we find that an increase in common ownership reduces entries, which may or may not improve welfare. Welfare has an inverted-U shaped relationship with the degree of common ownership, which implies that there is a strictly positive optimal degree of common ownership.