The counterpoint is the richest Southern families quickly recovered their positions in the years after the Civil War [1]... but that relied heavily on racist policies, and of course these families still owned capital like land.
0: http://www.pewtrusts.org/~/media/assets/2015/07/fsm-irs-repo...
1: https://www.nber.org/papers/w25700?utm_campaign=ntwh&utm_med...
There are a few relationships between IQ and conscientiousness and wealth, but they break down towards the extremes are not strong enough in magnitude to account for even single-quartile mobility.
Source?
It tracks wealth by surnames and argues that the ability to gain (or regain) wealth is inheritable. This thesis is in contradiction to some of the ways I've experienced the world, but it is a source supporting the parent's claim. For my own political inclinations I'd be happy to hear many others that support the opposite claim.
https://press.princeton.edu/books/hardcover/9780691162546/th...
https://archive.org/details/CSPAN2_20151004_190000_Book_Disc...
https://www.worldcat.org/title/son-also-rises-surnames-and-t...
http://gen.lib.rus.ec/book/index.php?md5=76BC054612F39ED6CBD...
Like say the Smith family was traditionally privileged and wealthy, but my great-great-grandfather lost his fortune. Am I actually any more likely to rise in fortune than the Jones' family next door that have been generationally poor for hundreds of years? Or does it only seem like that because I have many distant cousin's whose families maintained their advantages?
Second thing is that the fortune is typically not tracked here, because it’s really hard to get any historical data about fortune of any individuals, much less those not so famous. What Clark et al do is track status, and average out: for example, you can look at the people who graduated Oxford hundreds of years ago. As it turns out, their descendants today are overrepresented among UK’s doctors and lawyers. On the other hand, people carrying common job-related last names, like Smith or Taylor, are underrepresented as lawyers and doctors. In fact, in today’s UK, people carrying last names of Norman conquerors are still overrepresented among high status occupations in UK, although not by much, given a millennium of a regression towards the mean.
I recommend reading the book, it’s great.