I'm speaking of, say, $200,000+ a year wages. Not outrageously wealthy, but high.
There is far more probability that someone raised in a $200,000+ family will go on to earn $200,000+ than there is of a $20,000 family going on to earn $200,000. Regardless of IQ.
As for your last statement, that over generations of lower IQs, the wages will drop significantly - this is a possibility. But practically, it would be hard to reproduce the consistent drop of IQ over multiple generations as well as account for the inherent maintainability of wealth (you does not need to manage your wealth if you are rich enough to afford payment to someone who can manage it for you). If such a thing were probable, at some point we would reach a state of wealth distributed precisely according to IQ - but that does not seem remotely realistic as it would then require a child born with an anamolous high IQ born to a poor family jumping to a rich income, and vice versa.
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