1. School of Economics and Management, Xi’an University of Technology, Xi’an, Shaanxi, China
2. Guangdong Provincial Key Laboratory IRADS, BNU-HKBU United International College, Zhuhai, China
3. Faculty of Science and Technology, BNU-HKBU United International College, Zhuhai, China
4. Department of Economics, Western Michigan University, Kalamazoo, Michigan, USA