Another article on the same theme citing some different research. This article very sensibly sticks with what is known (there is an increasing correlation between income and investments in children, especially in education of children).
Unlike some of the other articles, it stays away from bolder claims about whether these correlations arise from indolence or resource constraints on the part of the low-income or about how much of the within-generational correlation in income is explained by differences in educational inputs (as opposed to heredity and many other factors).
http://www.nytimes.com/2013/05/10/us/10iht-letter10.html
