00300    a2200097   4500001001000000005001700010008004100027245004800068100001900116773006700135ART_1268420260410161908.0260409a                                 10aWelfare considerations of nonlinear pricing1 aRoberts, Kevin0 tThe Economic Journalg- Vol. 89, Nº 353 (mar. 1979)wREV12512