The study has been coordinated by economists Lucas Chancel, Thomas Piketty, Emmanuel Saez, and Gabriel Zucman. The report has a foreword by Nobel laureates Esther Duflo and Abhijit Banerjee.
Esther Duflo says fear of migration is often made worse by governments who want to be seen to be doing something about the problem.
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The number of poor in India has been slashed, says Duflo. 'But that does not mean we should be happy. That is not enough,' she says.
Esther Duflo pointed out that it was wrong to assume that giving handouts to the poor made them lazy.