Institution: | 1.School of Economics, Henan University of Economics and Law, Zhengzhou, 450046, China ;2.School of Economics and Management, University of Science and Technology Beijing, Beijing, 100083, China ;3.Institute of Economics and Management, Henan Agricultural University, Zhengzhou, 450046, China ;4.School of Economics & Management, Hubei Normal University, Huangshi, 435002, China ; |