Labor Market Returns to an Early Childhood Stimulation Intervention in Jamaica

Paul Gertler, James Heckman, Rodrigo Pinto, Arianna Zanolini, Christel Vermeerch, Susan Walker, Susan Chang-Lopez & Sally Grantham-McGregor
In 1986-1987, the Jamaican Study enrolled 129 growth stunted and disadvantaged children aged 9-24 months that lived in Kingston, Jamaica. Half of the children were randomized into a cognitive stimulation intervention which lasted 18 months (S. P.Walker, S. M. Chang, C. A. Powell, S. M. Grantham-McGregor, The Lancet 366, 1804 (2005)). A matched non-stunted group was also followed for comparison purposes. We resurveyed both the stunted and non-stunted samples in 2007-08, some 20 years after...
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