1 Sanders-Brown Center On Aging, University of Kentucky. Address : Sanders-Brown Center On Aging, University of Kentucky. 800 South Limestone Street. Lexington, KY 40536-0230, kryscio@email.uky.edu, Tel : +1 859 257 4064.
3 Département Economie et Gestion, Ecole Normale Supérieure de Cachan, Address : Département Economie et Gestion, Ecole Normale Supérieure de Cachan, 61, avenue du Président Wilson, 94230 Cachan, Tel. : +33 6 63 64 43 20; andre.depalma@ens-cachan.fr.
4 School of Operations Research and Information Engineering Cornell University. Address : ORIE, Cornell University, 219 Rhodes Hall Ithaca, NY 14853, +1 607 255 9130, pp396@cornell.edu.