I never said it is useless as an indicator of future income. I said it might be useless as an indicator of one's knowledge and skills, and knowledge and skills are what education is supposed to be about.
If you measure success by one's income, which is a good and clearly defined though still arbitrary indicator, I see no reason whatsoever to expect it would depend on IQ. People with high IQ are often less competitive and often question the need to maximize their income, which is obviously detrimental to such income.
If you measure success by one's income, which is a good and clearly defined though still arbitrary indicator, I see no reason whatsoever to expect it would depend on IQ. People with high IQ are often less competitive and often question the need to maximize their income, which is obviously detrimental to such income.