https://www.nuffieldtrust.org.uk/files/2022-09/1662995727-nuffield-trust-new-horizons-web.pdf
https://www.inegalites.fr/Dans-les-pays-riches-les-10-les-plus-fortunes-detiennent-la-moitie-du
https://www.veblen-institute.org/IMG/pdf/aubert_hdef.pdf
https://www.brookings.edu/articles/the-difference-in-how-the-wealthy-make-money-and-pay-taxes/