研討日期

201412610:30 ~ 12:00

研討地點

台大社會科學院710討論室

題目

Product Varieties in a Monopoly Model

作者

Changying Li and Jianhu Zhang

文獻出處

Working paper

報告人

李長英

參加人員

佟家棟、李長英、黃鴻、梁文榮、王光正、張瑞雲、彭正浩、蔡明芳、高國峯、曹古駒、王羿傑、呂得成、施姵全

摘要

This paper analyzes the monopoly provision of product variety in relation to the social optimum.  Four main results are obtained. First, compared to the social optimum, a monopolist always  undersupplies product varieties. Second, the quality range under a monopoly is always socially smaller. Third, an optimal-variety subsidy increases consumer surplus but reduces social welfare. Finally, a welfare-maximizing subsidy improves social welfare but generates an insufficient number of varieties in relation to an optimum without subsidy.