主题：Market Structure and Innovations in the Mobile App Market
主讲人：黄宇丰 美国罗切斯特大学
主持人：郑筱婷 暨南大学
时间：2026年7月1日（周三）上午10:00-12:00
地点：暨南大学石牌校区经济学院大楼（中惠楼）101室
摘要
Concerns emerge in antitrust policy that the rise in concentration in digital markets weakens dominant firms' incentives to innovate. However, this argument overlooks a key feature of digital markets: innovations such as software updates apply to all users, including existing ones, so firms with a larger user base may have stronger incentives to innovate. We assemble new, granular data in the mobile app market and measure innovation using text data from version update notes. Leveraging China's tightening gaming regulations—which exogenously weakens Chinese apps' U.S. market position—we show that non-Chinese apps that gain market position respond with more, not less, innovation. To evaluate welfare implications, we build a model that embeds Sutton's (1991) endogenous sunk cost idea within a Pakes-McGuire dynamic quality-ladder framework. We evaluate counterfactual policies that target market structure or business models, demonstrating that policies reducing concentration may dampen innovation incentives, while policies affecting revenue sources alter the balance between ad load and product quality. These findings suggest that concentration arising from innovation is not necessarily harmful to consumers.
主讲人简介
黄宇丰是美国罗切斯特大学Simon商学院的副教授，主要从事计量营销学领域的研究，尤其是在线和离线的市场机制设计、影响消费者和企业行为的政策干预的分析。他的许多研究成果关注数字经济时代平台企业的制度设计和创新行为、平台用户的行为和平台的监管政策，涵盖了学习、搜索、定价、广告行为以及需求估计的方法等等问题。他的研究成果发表在Journal of Marketing Research, Management Science, and Marketing Science等顶级期刊上。
校对 | 郑筱婷
责编 | 彭毅
初审 | 李仲达
终审发布 | 何凌云
（来源：暨南大学经济学院微信公众号）
