https://www.strategie.gouv.fr/sites/strategie.gouv.fr/files/atoms/files/fs-2019-fiscalite-capital-01-10-2019.pdf
https://www.socialeurope.eu/the-european-investment-banks-roadmap-to-2008
https://www.piie.com/blogs/realtime-economics/if-markets-are-right-about-long-real-rates-public-debt-ratios-will