1. School of Economics and Law, Chaohu University, Hefei, People’s Republic of China
2. Laboratory of Public Economics, University of Abomey-Calavi in Benin, Gbégamey-Cotonou, Benin
3. Faculty of Economic and Management, University of Abomey-Calavi in, Gbégamey-Cotonou, Benin
4. Faculty of Economics and Management, University of Abomey-Calavi in Benin, Gbégamey-Cotonou, Benin