00384    a2200121   4500001001000000005001700010008004100027245006800068100002100136700001600157773007200173999001700245ART_1187320260410161901.0260409a                                 10aSingle-crossing conditions in comparissons of tax progressivity1 aHemming, Richard1 aKeen, M. J.0 tJournal of public economicsg- Vol. 20, Nº 3 (abr. 1983)wREV11485  c25919d25919