http://www.iata.org/whatwedo/Documents/economics/impact_of_brexit.pdf
http://www.rug.nl/research/portal/files/41711829/cesifo1_wp6448.pdf
https://blogs.lse.ac.uk/brexit/2021/02/04/indyref2-scottish-independence-would-be-2-3-times-more-costly-than-that-of-brexit-and-rejoining-the-eu-wouldnt-make-up-the-difference/