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The achievement gap between children from high- and low-income families ...

USA: „The achievement gap between children from high- and low-income families is roughly 30 to 40 percent larger among children born in 2001 than among those born twenty-five years earlier.“

Univ.-Prof. Sean F. Reardon, „The Widening Academic Achievement Gap Between the Rich and the Poor“ (2011), S. 1