https://www.perfandersson.com/uploads/1/2/7/5/127505228/andersson_2022_cp_accepted_version.pdf
https://www.persee.fr/doc/rfeco_0769-0479_1995_num_10_2_978
https://commission.europa.eu/strategy-and-policy/eu-budget/long-term-eu-budget/eu-budget-2028-2034_en
https://www.socialeurope.eu/progressive-taxation-for-a-renewed-social-contract