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Notes -
First off, it's Chetty. Sorry! I got him confused with a paper on distributed deadlock detection.
Chetty managed to convince the IRS to give him detailed income data on... everybody. Yes, literally everybody. It's a sociologist's wet dream. Anyway, he did a bunch of analysis comparing parental vs. child incomes. The idea is that populations tend to mean-revert but they do so differently across races, etc... Whites mean-revert to a higher income level than blacks. It's a neat way of getting rid of the influence of starting conditions. The study itself is here: https://academic.oup.com/qje/article/135/2/711/5687353. The precise graph I'm talking about is here: https://academic.oup.com/view-large/figure/201514598/qjz042fig5.jpg.
A lot of HBD arguments rely on the assumption* that Black underperformance is due to genes. However, there isn't much of a reason that Black women should consistently have better IQ-related genes than Black men (or at least none that I've heard yet). If outcomes between Black women and Black men diverge substantially, that implies that Black underperformance might not be related to their genetics after all.
That's not "the same for Black girls as for the White population", it's the same for black women and white women, the white male curve is noticeably higher. And on a meta level, it's always suspicious when a paper drops categories midway through. Whatever conclusions you want to infer from this graph, they would be much firmer if it also had asians.
Good catch on white women vs. white men. I wonder what causes the difference. I do think your comment on Asians is a bit of a non-sequitur.
Why a non-sequitur? Earlier parts of section IV show a higher steady state for asians than for whites, then they get dropped from the comparison. If they were included in this graph, it would either show that their advantage is also mostly male and asian women match white women, in which case maybe this graph says a lot more about gender than about race. Or the asian over white advantage is maintained for both genders, which would make for a much stronger anti-HBD argument. Because one of the more appealing HBD talking points imo is that by Occam's razor the black/white gap and the white/asian gap have the same basis.
Fair point. Thanks.
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