[Besprechung von:] Green, Christopher: Negative taxes and the poverty problem. Washington 1967. [= Studies of Government Finance.] Brookings Institution. Hildebrand, George H.: Poverty, income maintenance, and the negative income tax. Ithaca 1967. [I.L.R. Paperback.] New York State School of Industrial and Labor Relations, Cornell Univ. [No 1]