Can Randomized Trials Eliminate Global Poverty? (Nature)

From article: 

In 70 local health clinics run by the Indian state of Haryana, the parents of a child who starts the standard series of vaccinations can walk away with a free kilogram of sugar. And if the parents make sure that the child finishes the injections, they also get to take home a free litre of cooking oil. These simple gifts are part of massive trial testing whether rewards can boost the stubbornly low immunization rates for poor children in the region. 

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