https://scholar.harvard.edu/files/rogoff/files/nber26760_why_is_euro_punching_below_its_weight.pdf
https://wiiw.ac.at/rrf-2-0-ein-permanenter-eu-investitionsfonds-im-kontext-von-energiekrise-klimawandel-und-eu-fiskalregeln-dlp-6413.pdf
https://www.sciencemag.org/news/2021/06/these-ancient-weights-helped-create-europe-s-first-free-market-more-3000-years-ago?utm_campaign=news_daily_2021-06-28&et_rid=682362580&et_cid=3828153