1. Daisheng Tang, Professor, School of Economics and Management, Beijing Jiaotong University, Beijing, China
2. Tao Bu, PhD Candidate, School of Economics and Management, Beijing Jiaotong University, Beijing, China;, Email: Tao_Bu@126.com
3. Qundi Feng, PhD Candidate, College of Economics and Management, South China Agricultural University, Guangzhou, China
4. Yahong Liu, PhD Candidate, School of Economics and Management, Beijing Jiaotong University, Beijing, China
5. Xuefan Dong, Postdoctoral Fellow, School of Economics and Management, Beijing Jiaotong University, Beijing, China