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Originally Posted by Manx
Not to say there aren't plenty of other factors involved, but I would not draw the conclusion that IQ predicts income better than SES.
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Well, I wouldn't draw that conclusion either. SES certainly predicts income better than IQ. Looking back at my posts, I should have been more specific: IQ (controlled for SES OF PARENTS) predicts income better than SES of PARENTS (controlled for IQ).
Within family studies of IQ and SES support the primacy of IQ over parental SES in determining SES. Waller (I don't remeber the year) found that biological children above the average IQ of their family tend to go up in SES while those below the family average tend to go down in SES.
Also, IQ is heritable (broad sense heritability estimates range from 0.67 to 0.78). This means that ~40-60% in the variation in IQ can be attributed to variation in genes. It also means that 40-60% of the variation in IQ can be explained by environmental variation (if we neglect the fact that people may choose their own environments based on their intelligence). So, IQ is not immutable. There is something about low IQ/Low SES environments that lowers IQ of children, perhaps contributing to negative social outcomes. No one has been able to come up with good ways of altering environments to play with the variance due to environment . Other than adoption: Adoption studies have found that the IQs of children adopted away from their biological parents and into higher IQ environments were nearly a standard deviation higher than what would be expected from their mother's IQ. (Though still lower IQ than biological children of parents of high IQ).