First Author:   Shlomo Wever CORE and SMU weber@core.ucl.ac.be   34 Voie du Roman Pays Louvain-la-Neuve, 1348, Belgium   32-10-472012(Phone) 32-10-472012(Fax) Second Author: Alexei Savvateev CORE savvateev@core.ucl.ac.be   34 Voie du Roman Pays Louvain-la-Neuve, 1348, Belgium   32-10-473029(Phone) 32-10-474301(Fax) Third Author: Michel Le Breton GREMAQ and IDEI, University of Toulouse 1 lebreton@cict.fr   Maunufacture des Tabacs, Bat F, 21 Allee de Brienne Toulouse, 31000, France   33-561128577(Phone) 33-561128637(Fax) Fourth Author: Anna Bogomolnaia Department of Economics, Rice University annab@rice.edu   Baker Hall 255, 6016 Main Str. Houston, 77005, USA   713-3483414(Phone) 713-3485278(Fax)