https://www.ifs.org.uk/inequality/wp-content/uploads/2019/05/The-IFS-Deaton-Review-launch_final.pdf
https://theconversation.com/the-gig-economy-is-nothing-new-it-was-standard-practice-in-the-18th-century-81057
http://neilcummins.com/tie_cog.pdf
https://science.sciencemag.org/content/365/6448/70