Hal Varian: The Economics of Internet search
rencontre geneve.ch http://www.youtube.com/watch?v=CT2k4z0xPwE&feature=player_detailpage
http://comvicente.pt/?borw=mensagem-de-namoro-crist%C3%A3 Apropiación Incluyente Google Precios diferenciales Subastas Varian