First Author:   Olivier Darné LAMETA/CNRS, Faculty of Economics, University of Montpellier I darne@lameta.univ-montp1.fr   LAMETA/CNRS, Faculty of Economics, Espace Richter, Avenue de la Mer, BP 9606 Montpellier, 34054, France       http://www.lameta.univ-montp1.fr/membres/doctorants/darne.html