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Under the new measure, Nerone's welfare payments are to resume in July.
Critics argue that the cash-transfer programs have been corrupted, and some Argentine opponents say that low-income women get pregnant to benefit from welfare.
Even a proponent such as Lustig said "they need to be complemented with other initiatives to create transformative processes and avoid creating cultures of dependency."
But such programs have helped pull millions of people from poverty in 18 Latin American nations. Brazil's Bolsa Familia program alone has helped about a quarter of that country's more than 190 million people.
"Conditional cash transfers are the most important social innovation of the last 15 years," Lustig said. "They have allowed millions to live a little better, they have redistributed income and helped combat poverty where the market fails."