
https://theconversation.com/the-gig-economy-is-nothing-new-it-was-standard-practice-in-the-18th-century-81057

https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef1710en.pdf

https://www.hamiltonproject.org/assets/files/UnionsEA_Web_8.19.pdf