Here are graphs for males and females generated from General Social Survey data (sample size = 25,589). (For many analyses, it is appropriate to use median income, but we are interested in inequality so the mean makes more sense).
Mean individual income (constant $)--males
Mean IQ--males
For men, the black-white gap in income grew over the past five decades. The gap in constant dollars is $12,300 in the 1970s and $18,400 in the 2010s. This kind of widening should lead to a larger IQ gap, but the IQ difference shrunk from 10.6 to 8.2 points over the same period.
Mean individual income (constant $)--females
Mean IQ--females
We see the same widening income gap for women from $1,300 in the 1970s to $5,900 in the 2010s. Over the same period, the IQ gap dropped from 11.6 to 8.6 points.
Once again, the trends contradict the liberal prediction.
Now, you might respond that GSS data do indicate a narrowing of the racial IQ gap over the past five decades, and indeed they do. We don't know for sure why that is--it might be due to the horrible black high schools in the South getting better in the last few decades (perhaps vocabularies can be improved a little with decent schools)--but the point of this post is that it does not look like the difference in black and white IQs is due to the fact that whites make more money.
UPDATE: Sean Last posted this Pew graph which shows a widening in the black-white income gap:
More hybrids, who still identify as black.
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