This is the conclusion of Thomas Picketty's 2013 book, "Capital in the 21st Century." Due to the historical averages of the rate of return on capital, he concluded empirically that wealth will continue to concentrate to the point to inheritors, to the extent that individuals become increasingly unable through labor to achieve parity to the inheritors. The book was very provocative in economist circles, but even the c…
Hardly empirical. The data shows the opposite. ~80% of current billionaires in the U.S. are self-made first generation.
I see conflicting evidence to the claim[0,1,2]
I'd argue that you also got to be really careful with these studies. Defining "self-made" is not a straight forward issue. In some sense, no person is self made as we're all products of our environments and the opportunities presented to us. If it were consistent you wouldn't see these numbers swing between studies, so don't just pick the highest one. Metrics are deceptive because their subtleties and you need to carefully consider their alignment.
[0] https://finance.yahoo.com/news/79-millionaires-self-made-les...
[1] https://www.businessnewsdaily.com/2871-how-most-millionaires...
[2] https://www.fool.com/the-ascent/personal-finance/articles/st...