1. Department of Economics, University of Kansas, Lawrence, KS 66045; Wang Yanan Institute for Studies in Economics, Ministry of Education Key Laboratory of Econometrics and Fujian Key Laboratory of Statistical Science, Xiamen University, Xiamen, Fujian 361005, China ()
2. Wang Yanan Institute for Studies in Economics, Department of Statistics, School of Economics, Ministry of Education Key Laboratory of Econometrics and Fujian Key Laboratory of Statistical Science, Xiamen University, Xiamen, Fujian 361005, China ()