https://www.socialeurope.eu/progressive-taxation-for-a-renewed-social-contract
https://www.imf.org/-/media/Files/Publications/PP/2023/English/PPEA2023001.ashx
http://eurodad.org/files/pdf/58d39b90e6546.pdf
https://www.nber.org/system/files/working_papers/w28598/w28598.pdf