https://www.dsgv.de/newsroom/presse/190912_PM_EZB_30.html
https://www.foreignaffairs.com/united-states/2008-crisis-never-saw-coming
https://www.eca.europa.eu/Lists/ECADocuments/REW19_09/REW_EU-defence_EN.pdf
https://www.brookings.edu/articles/the-hutchins-center-explains-the-neutral-rate-of-interest/