http://www.morganstanley.com/ideas/global-trade-protectionism
http://blogs.lse.ac.uk/brexit/2017/10/24/the-eu-isnt-protectionist-its-one-of-the-most-open-economies-in-the-world/
https://ukandeu.ac.uk/the-uk-internal-market-bill-breaking-law-and-reputation/?mc_cid=7627d659c2&mc_eid=815b1928ec
https://sosapadilla.github.io/files/papers/Bianchi_Sosa-Padilla_PP.pdf