Néjia Zaouali University of Cergy-Pontoise, THEMA   33, boulevard du Port Cergy-Pontoise cedex, 95011 France   Nejia.Zaouali@eco.u-cergy.fr   http://thema.u-paris10.fr/   Biographical Sketch: PhD Student   Primary Research Focus: Urban transport pricing   JEL Areas: R : Urban, Rural, and Regional Economics R2 : Urban, Rural, and Regional Economics: Household Analysis: General