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You get the students other universities didn't pick. That means that you often get strange correlations at mid level schools, such as the dumbest students took AP while the smartest students didn't since AP classes helps with school admission.

That is similar to the brilliant jerk effect, if a person is smart enough to get a job at a top company but didn't they are very likely going to be a jerk. So brilliant jerks are not a thing at top companies, but at mediocre companies which picks what the top didn't they have to choose between brilliant jerks and dim friendly people making it seem like brilliant people are often jerks.

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