演讲人: Leonard Baum，德国柏林赫尔蒂学院博士候选人、香港大学访问研究员

时间：2026年10月23日 （周五）10：00

地点：同济大厦A楼1101会议室

演讲摘要：

Growing global concern about the problems associated with concentrated market power in the digital economy is leading to a renewed interest in competition policy globally. This talk examines how market structure in China’s digital economy has evolved under a shifting regulatory environment, while also introducing an emerging research agenda on the longer-term competitive dynamics of digital markets. The study presented here centers on China’s recent “tech crackdown,” treating the shift in competition policy that began in late 2020 as a quasi-natural experiment. Leveraging stock-market data from 1,142 publicly listed Chinese ICT firms, it develops a market-capitalisation-based approach to measuring concentration and applies difference-in-differences and event-study analyses. These analyses identify a reduction in concentration in the primary markets of China’s three dominant platforms—Baidu, Alibaba, and Tencent—alongside a broader slowdown in market-capitalisation growth across China’s digital economy. These results also expose the limits of conventional revenue- and profit-based measures of market power in the digital economy.

演讲嘉宾简介：

Leonard Baum is a PhD candidate at the Hertie School in Berlin and visiting researcher at the University of Hong Kong (UHK). His dissertation examines competition and industrial policy in the digital economy from a comparative perspective, with a particular focus on the European Union, China, the United States, and India. Previously, Leonard worked as a Research Assistant to Prof. Joanna Bryson at the Centre for Digital Governance and as a Policy Advisor on labour and social policy for the Christian Democratic Union (CDU). His professional experience also includes roles in the German Bundestag, the European Parliament, and consulting. He is currently working with OECD Digital Economy Fellow Brian Kahin on a book project exploring the intersection of the digital economy and public policy.