https://www.brookings.edu/articles/why-the-founders-cared-about-trade-and-taxes/
https://www.socialeurope.eu/2017/06/mercron-franco-german-tandem-back-berlins-terms/
https://www.bruegel.org/wp-content/uploads/2021/09/PC-2021-18-0909.pdf
https://www.dsgv.de/newsroom/presse/190912_PM_EZB_30.html