Plug, Erik J. S.; Vijverberg, Wim P. M. - 2001
One would expect that family income is an important positive factor in the school attainment of children. However … unobserved parental ability. In the end, family income still has a significant effect, which must therefore be causative. It … implies that high-ability children in low-income families face binding credit constraints that society may wish to relieve. …