Gregory Clark is the one that saved the field of economics/sociology for me.
Again Gregory Clark dispels this myth.
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The 3 gen rise is a myth. No one really rises from peasant to lord unless it was a time of troubles, and they do 'regress to the mean' within 3 gen.
Those who do reach the top from lower ranks usually start in at least at the 'second base' (top 10-20% rung of socioeconomic ladder), not from bottom.
Have you read The Son Also Rises? (No, not Hemmingway) Basically a whole book on this sort of question
I think you'd love it.
https://www.amazon.com/Son-Also-Rises-Surnames-Princeton/dp/0691168377
There's certainly evidence that the nobility of before were genetically more intelligent, I'll admit there's not really direct research on this, which would be difficult, but there's definitely a lot of evidence to suggest this, for example, the nobility of before is still more overepresented in top position, actually, as it seems, socioeconomic mobility is basically the same across a wide selection of different societies over a long period of time. Why does this matter? Because this suggests that things that predicts success would be the same over time, that is, today, which is intelligence. There's also evidence in itself to suggest that this is the case over time a genetic model of this fits over time. The fact that intelligence (which is highly heritable, of course), correlate and cause high socie economic status today is true. I will however admit my comment was a bit speculative in assuming they bred higher leadership abilities.
Let me lay it out for you:
I was going to post more, but I realized it would probably be a waste of effort.