
https://www.economiesuisse.ch/de/artikel/ohne-schuldenbremse-droht-die-schuldenspirale

https://blogs.lse.ac.uk/brexit/2021/02/04/indyref2-scottish-independence-would-be-2-3-times-more-costly-than-that-of-brexit-and-rejoining-the-eu-wouldnt-make-up-the-difference/

https://www.project-syndicate.org/commentary/three-goals-to-guide-european-union-renewal-by-emmanuel-macron-2019-03/french