Standard measures of intergenerational mobility treat parental income as a single average across childhood. In this episode, Steven Durlauf, Frank P. Hixon Distinguished Service Professor at the Harris School of Public Policy and Director of the Stone Center for Research on Wealth Inequality and Mobility, describes how parental income during the tween and adolescent years (ages 12-18) is far more predictive of adult outcomes than parental income during early childhood.