https://www.socialeurope.eu/progressive-taxation-for-a-renewed-social-contract
https://www.nber.org/system/files/working_papers/w27488/w27488.pdf
https://static1.squarespace.com/static/5ef4d1da53822a571493ebd0/t/5ffcfaea93e2771243fce2ff/1610414842497/A-Wealth-Tax-For-The-UK.pdf
https://www.dsgv.de/newsroom/presse/190912_PM_EZB_30.html