1. Department of Economics University of Kansas Lawrence Kansas USA
2. Wang Yanan Institute for Studies in Economics and Fujian Key Laboratory of Statistical Sciences Xiamen University Xiamen Fujian China
3. Department of Statistics and Data Science, School of Economics Xiamen University Xiamen Fujian China
4. Laboratory of Digital Finance Xiamen University Xiamen Fujian China
5. School of Finance Jiangxi University of Finance and Economics Nanchang Jiangxi China