"Among older children, evidence suggests that the gap between high- and low-income primary and secondary-school students has increased by almost 40 percent over the past thirty years."

This article states that the Haves are born with similar intelligence but receive wildly unequal opportunities in schools. It explains how students with little family income go from being as equally favored as their richer counterparts to being favored far less than them. It demonstrates, seemingly beyond reasonable doubt, that the Haves are much more advantaged than their Have-not classmates