1. School of Economics, Minzu University of China, Beijing 100081, China
2. Department of Economics, COMSATS University Islamabad (C.U.I.), Islamabad 44000, Pakistan
3. Department of Business Administration, College of Business and Administration, Princess Nourah bint Abdulrahman University, Riyadh 11671, Saudi Arabia
4. School of Management, Hebei Finance University, Baoding 071051, China
5. Department of Economics and Business, Faculty of Economic Sciences, University of Oradea, 410087 Oradea, Romania