https://www.mckinsey.com/mgi/our-research/the-complication-of-concentration-in-global-trade
https://ec.europa.eu/commission/sites/beta-political/files/customs_controls_0.pdf
https://www.project-syndicate.org/commentary/us-trade-war-with-china-has-entered-dangerous-new-phase-by-anne-o-krueger-2023-08?barrier=accesspaylog
https://blogs.lse.ac.uk/europpblog/2023/03/13/what-impact-have-eu-sanctions-had-on-the-russian-economy/