Among whites, about two-thirds of the children from middle-income families grew up to have higher incomes than their parents, she said

Isaacs compiled the reports for the Economic Mobility Project, a collaboration of senior economists and researchers from four Washington think tanks that span the ideological spectrum. The project is funded and managed by the Pew Charitable Trusts.

Isaacs used survey data from the Panel Study of Income Dynamics, which is conducted at the University of Michigan.