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What it isn't
Why not use the measures that are available and track people's progress through life? We've done this with IQ and found that it is a good predictor of income. IQ scores predict our incomes, yes. But there is no direct causal relationship between IQ scores and high income. The school system is the main catalyst of the positive correlation between high IQ score and high income. The school system is a system designed to select the highest IQ scores. from J.T. Gatto, The poison of democracy Now intelligence tests were huckstered in school district after school district; fortunes accrued to well-placed pedagogical leaders and their political allies. Every child would now be given a magical number ranking it scientifically in the great race of life. School grades might vary according to the whim of teachers, but IQ scores were unvarying, an emotionless badge of biological honor or shame, marking innate, almost unchanging ability. Millions of tests administered annually to primary and secondary students would prove the "value rank" of the American peoples. Mental ages were dutifully entered on permanent record cards with as much assurance as Horace Mann, Barnas Sears, WilliamTorrey Harris, John Dewey, and G. Stanley Hall had accepted skull maps drawn by their favorite phrenologists. Schools were designed to select people with high IQ's. Higher education is meant for people selected by schools. Good jobs are given to people who passed higher education Good jobs provide high income. High IQ's are a great predictor of high income. You always thought school is the best place to learn? On average tutored students score better than 98% of classroom students – a two sigma shift. (from mylearningblog
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