
https://www.nber.org/system/files/working_papers/w27488/w27488.pdf

https://blogs.lse.ac.uk/brexit/2021/01/11/article-16-of-the-ireland-northern-ireland-protocol-offers-no-quick-fix/

https://www.progressivepolicy.org/blogs/trade-fact-of-the-week-trump-campaign-proposes-the-highest-u-s-tariff-since-1937/