https://www.berkshirehathaway.com/letters/2019ltr.pdf
https://knowledge.wharton.upenn.edu/article/will-the-2-trillion-coronavirus-relief-package-be-enough/?utm_source=kw_newsletter&utm_medium=email&utm_campaign=2020-03-31
https://www.dbresearch.de/PROD/RPS_DE-PROD/PROD0000000000523908/Deutschland%3A_Konjunktur_kurzgefasst.PDF
https://www.bruegel.org/system/files/2024-05/WP%2012%202024_0.pdf