https://www.fraserinstitute.org/sites/default/files/economic-freedom-of-the-world-2021.pdf
https://www.bloomberg.com/news/articles/2019-09-11/world-s-oldest-customs-union-and-u-k-reach-a-post-brexit-deal
https://www.socialeurope.eu/eu-competition-policy-needs-a-fundamental-rethink
https://www.thelancet.com/action/showPdf?pii=S2214-109X%2825%2900189-5