
https://theconversation.com/bulgaria-is-joining-the-euro-in-january-and-not-everyone-is-pleased-258626

https://www.brookings.edu/articles/the-hutchins-center-explains-the-neutral-rate-of-interest/

https://www.bundesverfassungsgericht.de/SharedDocs/Pressemitteilungen/DE/2020/bvg20-032.html