https://www.wto.org/english/res_e/booksp_e/anrep_e/ar23_e.pdf
https://www.mckinsey.com/mgi/our-research/the-complication-of-concentration-in-global-trade
https://ecipe.org/wp-content/uploads/2023/07/ECI_23_PolicyBrief_08-2023_LY02.pdf
https://trade.ec.europa.eu/doclib/docs/2021/september/tradoc_159803.pdf