https://knowledge.wharton.upenn.edu/article/is-portugals-drug-decriminalization-a-failure-or-success-the-answer-isnt-so-simple/
https://www.project-syndicate.org/commentary/german-constitutional-court-ecb-ruling-may-threaten-euro-by-katharina-pistor-2020-05
http://www.failteireland.ie/FailteIreland/media/WebsiteStructure/Documents/Brexit/Exchange-rate-impacts-Update-19th-June-2018.pdf?ext=.pdf