00306    a2200097   4500001001000000005001700010008004100027245004700068100002100115773007200136ART_1185420260410161901.0260409a                                 10aIncome tax progressivity and labour supply1 aHemming, Richard0 tJournal of public economicsg- Vol. 14, Nº 1 (ago. 1980)wREV11485