"Here’s a fact that may not surprise you: the children of the rich perform better in school, on average, than children from middle-class or poor families. [...] Whether you think it deeply unjust, lamentable but inevitable, or obvious and unproblematic, this is hardly news. It is true in most societies and has been true in the United States for at least as long as we have thought to ask the question and had sufficient data to verify the answer."