USA: A given difference in family incomes now corresponds to a 30 to 60 percent larger difference in achievement than it did for children born in the 1970s …

USA: „A given difference in family incomes now corresponds to a 30 to 60 percent larger difference in achievement than it did for children born in the 1970s.“

Univ.-Prof. Dr. Sean Reardon, „The Widening Academic Achievement Gap Between the Rich and the Poor“ (2011), S. 2