James Heckman, the Nobel Prize-winning economist, has examined how the returns on education break down for individualswithdifferentbackgroundsandlevelsofability.
As the economist JamesHeckman has demonstrated, successful preschools don't increase the intelligence of toddlers or endow them with new knowledge they take to kindergarten.
Only three years have passed since JamesHeckman and Daniel McFadden were also honoured for sharpening econometrics, the statistical methods with which economic data are analysed.
The most respected research on the effects of preschool programs probably comes from JamesHeckman, who studied the effects of the Perry Project preschool in Michigan on kids later in life.