https://www.cesifo-group.de/DocDL/EEAG-2018.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
https://www.brookings.edu/articles/as-local-governments-finalize-their-american-rescue-plan-priorities-some-dollars-have-become-easier-to-spend/
https://theconversation.com/que-factores-explican-la-hiperinflacion-venezolana-216135