While we think of intergenerational income mobility as a sign of meritocracy, if we did live in a genuine meritocracy, it is hard to know how much mobility we should expect to see.

• 尽管我们认为两代人之间的收入流动性是一种精英体制的标志，但如果我们的确生活在一个真正的精英体制中，很难知道我们应当希望看到多大程度的流动性。