https://www.socialeurope.eu/2017/06/understanding-productivity-puzzle/
https://www.icij.org/investigations/paradise-papers/fairer-transparent-tax-system-will-lost-vested-interests-without-public-pressure-warns-eu-tax-commissioner/
https://www.sachverstaendigenrat-wirtschaft.de/fileadmin/dateiablage/gutachten/jg202223/JG202223_Gesamtausgabe.pdf
https://www.piie.com/blogs/realtime-economics/european-commissions-fiscal-rules-proposal-bold-plan-flaws-can-be-fixed?utm_source=update-newsletter&utm_medium=email&utm_campaign=piie-insider&utm_term=yyyy-mm-dd