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From Richard Posner: "...colleges and graduate (including professional) schools provide a screening and certifying function. Someone who graduates with good grades from a good college demonstrates intelligence more convincingly than if he simply tells a potential employer that he's smart; and he also demonstrates a degree of discipline and docility, valuable to employers, that a good performance on an IQ test would not demonstrate. (This is an important point; if all colleges did was separate the smart from the less smart, college would be an inefficient alternative to simple testing."