https://www.economiesuisse.ch/de/artikel/die-praemien-sind-zu-35-prozent-einkommensabhaengig
https://www.strategie.gouv.fr/sites/strategie.gouv.fr/files/atoms/files/fs-2020-dt-inegalites-primaires-redistribution-decembre.pdf
https://verfassungsblog.de/la-foule-le-peuple-et-la-societe-2/
https://www.mckinsey.com/~/media/McKinsey/Industries/Public%20and%20Social%20Sector/Our%20Insights/The%20social%20contract%20in%20the%2021st%20century/MGI-The-social-contract-in-the-21st-century-Full-report-final.pdf