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What Justice Scalia is referring to is the 'mismatch theory' popularized by Stuart Taylor and Richard Sander in their book, the idea is that if a student is admitted to a school they are not academically prepared for then they will not perform up to their own potential. This is a theory -- contested of course -- but I don't want people to get the idea that it means that all black students are not as smart as white students, or even that they are not as well prepared across the board.