Guaranteed Income. SSI and the Well-Being of the Elderly Poor

Kathleen M. McGarry, The Distributional Aspects of Social Security and Social Security Reform (University of Chicago Press, 2002), chap. 3, https://www.nber.org/books-and-chapters/distributional-aspects-social-security-and-social-security-reform/guaranteed-income-ssi-and-well-being-elderly-poor.