Jean-Francois Laslier CNRS and Ecole Polytechnique, Paris   Laboratoire d'Econometrie Ecole Polytechnique 1 rue Descartes Paris, 75005 France   laslier@poly.polytechnique.fr   http://ceco.polytechnique.fr/   Biographical Sketch: Graduated from the Ecole Nationale de la Statistique et de l'Administration Economique, Paris 1984. Research Director at the CNRS (National Center of Scientific Research, France)   Primary Research Focus: Social Choice, Political Science, Game Theory   JEL Areas: D7 : Analysis of Collective Decision-Making: General C7 : Game Theory and Bargaining Theory:General