北京大学发展和政经workshop第11期

讲座题目：Cross-border Spillover Effects of Dams along International Rivers

主讲人：雷宇翔，香港科技大学

时间：2025年5月28日 （周三）10:30-12:00

地点：北京大学国家发展研究院承泽园校区245教室

摘要:     

Hydropower dams on international rivers often trigger disputes due to neglecting externalities in downstream countries. Focusing on Chinese dams on the upper Mekong River, this paper examines the cross-border impacts of dams. Employing machine learning and difference-in-difference methods, I find that dam spillover effects depend on climate conditions. Under normal conditions, dams smooth water levels across seasons, boost agricultural productivity, and reduce large-scale fires. However, during extreme weather, dams' operations conflict with downstream interests, turning externalities negative and exacerbating damages in downstream countries. With the increasing frequency of extreme weather events, the negative cross-border impact may dominate.

主讲人简介：

Yu-Hsiang Lei is an Assistant Professor of Economics at the Hong Kong University of Science and Technology. He obtained his PhD in Economics from the London School of Economics and received undergraduate education from National Taiwan University. He is a development economist, and his research interests also span the fields of political economy and public economics, with a special regional emphasis on China. His work mainly focuses on producing empirically grounded evidence to address critical challenges faced by developing countries and to provide insights to understand broader development and governance issues.
 

北京大学发展和政经workshop第12期

讲座题目：Deceptive online networks in the US 2020 elections

主讲人：

Jennifer Pan, Sir Robert Ho Tung Professor of Chinese Studies, Professor of Communication, Stanford University

时间：2025年5月28日 （周三）14:00-15:30

地点：北京大学国家发展研究院承泽园校区249教室

摘要:     

Deceptive online networks are coordinated efforts that use identity deception to pursue strategic political or financial goals. During the US 2020 elections, these networks reached at least 37 million Facebook and 3 million Instagram users, representing 15% and 2% of the platforms' active US adult users, respectively. Only 3 networks out of 49--1 network with explicitly political aims and 2 that appeared to use politics as a lure for profit---were responsible for over 70% of users reached. Notably, accounts unaffiliated with the networks played a significant role in facilitating this reach by resharing content the three networks produced. Deceptive networks, regardless of whether their goals were political or financial, reached users who were older, more conservative, more frequently exposed to content from untrustworthy sources, and spent more time on Facebook.

主讲人简介：

Jennifer Pan is a political scientist whose research focuses on political communication and digital media. She is the Sir Robert Ho Tung Professor of Chinese Studies, Professor of Communication and a Senior Fellow at the Freeman Spogli Institute at Stanford University. Dr. Pan's research uses experimental and computational methods with large-scale datasets to answer questions about the role of digital media in politics. Her work has appeared in peer-reviewed publications such as the American Political Science Review, American Journal of Political Science, Journal of Politics, Science, and Nature. She graduated from Princeton University, summa cum laude, and received her Ph.D. from Harvard University’s Department of Government.

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