I've hit upon this highly cited paper -
https://www.nber.org/papers/w8524.pdf
and am currently looking through the citations for discussions, rebuttals etc
https://scholar.google.co.uk/scholar?cites=14087286868025879467&as_sdt=2005&sciodt=0,5&hl=en
My first thought is that the usual folks will point to "racial heterogeneity" and the other usual folks will point to "racial animosity".
As I said, feels like common sense.Racial animosity in the US makes redistribution to the poor, who are disproportionately black, unappealing to many voters.
What decidedly does not feel like common sense (at least to me) is how the American Left seems to have gone all "Welp, people are too racist to accept equal treatment [of races]... let's try to sell them positive discrimination [of minorities] instead!"
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