First Author:   Antoine Le Riche School of Economics, Sichuan University, P. R. China & CAC-IXXI, Complex Systems Institute, France antoineleriche@scu.edu.cn   No.24, South Section 1, Yihuan Road Chengdu, 610042, P. R. China   +86 2885412504(Phone) +86 2885412504(Fax) Second Author: Francesco Magris LEO, University François Rabelais of Tours & CAC-IXXI, Complex Systems Institute, France francesco.magris@univ-tours.fr   Avenue Jean Portalis, BP 607 Tours Cedex 03, 37206, France   +33 247361077(Phone) +33 247361091(Fax)