https://www.omfif.org/analysis/commentary/2017/june/uk-risks-falling-behind-europe/
https://www.socialeurope.eu/euro-enlargement-convergence-definancialization
https://www.taxpolicycenter.org/sites/default/files/publication/163549/report-taxing-business-incomes-evidence-from-the-survey-of-consumer-finances.pdf
https://www.bundesverfassungsgericht.de/SharedDocs/Pressemitteilungen/DE/2020/bvg20-032.html