Academy of Mathematics and Systems Science, CAS
Colloquia & Seminars

Speaker:	刘潇副教授，清华大学经管学院
Inviter:
Title:	The gift contagion in online groups: evidence from Wechat red packet
Time & Venue:	2020.07.03 10:30-11:30 腾讯会议 ID：222 599 665
Abstract:	Our study seeks to identify the social contagion of in-group gifts: if gifts trigger their recipients to send more gifts subsequently, the actual impact of a gift on group dynamics would be greatly amplified. Causal identification of contagion is always challenging in observational data; To identify gift contagion, we conduct a natural experiment using a large sample of 36 million online red packets sent within 174,131 chat groups on WeChat, one of the largest social network services worldwide. Our natural experiment is enabled by WeChat’s random gift amount algorithm, with which the amount that a user receives does not depend on her own attributes. We find that, on average, receiving one more dollar causes a recipient to send 18 cents back to the group within the subsequent 24 hours. Moreover, this effect is much stronger for “luckiest draw” recipients or those who receive the largest share from a red packet, suggesting a group norm according to which the luckiest draw recipients should send the first subsequent red packets. Additionally, we find that gift contagion is affected by in-group friendship network properties, such as the number of in-group friends and the local clustering coefficient. 报告人简历：刘潇博士，现为清华大学经济管理学院经济学系副教授，2012年获美国密歇根大学信息学博士学位，2010获密歇根大学经济学硕士学位，2006年获中国人民大学理学学士学位。研究领域为博弈论、实验经济学、行为经济学、信息经济学等。