https://www.ecb.europa.eu/stats/accesstofinancesofenterprises/pdf/ecb.safe202005~c4b89a43b9.en.pdf
http://gabriel-zucman.eu/files/AJZ2017.pdf
https://www.brookings.edu/articles/house-republicans-want-to-cut-the-irs-budget-again/
https://www.riksbank.se/sv/press-och-publicerat/nyheter-och-pressmeddelanden/pressmeddelanden/2019/reporantan-hojs-till-noll-procent/