In an op-ed for the New York Times, IPA researcher Chris Blattman raises the idea of cash transfers to the homeless in the United States. Among other cash transfer evidence in developing countries, he cites his work with IPA studying cash transfers to urban youths in Liberia. He also discusses a pair of studies in Uganda: an evaluation of WINGS, a cash transfer program for women, and a study of YOP, a similar program for rural youths.
Blattman posted some further thoughts on his blog. You can also read his article on cash transfers in developing countries in the May/June issue of Foreign Affairs, co-written with IPA researcher Paul Neihaus, and listen to his interview on NPR's Planet Money about the Liberia study.