You might like the interview with this researcher: https://hiddenbrain.org/podcast/money-2-0-the-rich-and-the-rest-of-us/ . Relevant research discussed: Capital Without Borders Wealth Managers and the One Percent, by Brooke Harrington, 2020.

The Broken Ladder: How Inequality Affects the Way We Think, Live and Die, by Keith Payne, 2018.