The authors thank the associate editor, two anonymous reviewers, Brian Bushee (editor), Wayne Thomas, Deren Xie, and the workshop participants at Fudan University, Jinan University, Peking University, Sun Yat-sen University, Tsinghua University, University of Southern California, Wuhan University, and Yale University for their helpful suggestions and comments. M. Luo thanks Dan Yu and Wanxin Luo for life-long continued support. X. Zhang thanks the Laboratory of Big Data Driven Management Behaviors and Decision Making, Ministry of Education, for research assistance.