1. School of Economics, Guizhou University of Finance and Economics, Guiyang 550025, China
2. School of Economics, Jiangxi University of Finance and Economics, Nanchang 330013, China
3. School of Finances, Zhongnan University of Economics and Law, Wuhan 430073, China
4. School of Economics and Management, Jiangxi Agricultural University, Nanchang 330045, China