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Sorry, doesn't hold. Some more convincing studies examined the outcomes of Georgia land lotteries which were effectively a randomized controlled trial where the "intervention arm" got a valuable piece of land (by winning the lottery) and the "control arm" didn't get anything. See e.g. this and other studies.
Now, if you have a continuing advantage (IQ) that continues to hold while your group mostly intermarries, things are different.
Culture, on the other hand, persists across generations relatively well.
By the way, while slavery was ended 150 year ago, segregation remained in force until after the WW2 and so is a much more recent phenomenon, within living memory.
Interesting.
In regard to the scenario (person A and person B) I gave above, I'm not sure your study refutes what I'm saying. Wealth can be squandered, sure. But wealth, along with a solid education, a well-developed relevant skil... (read more)