https://frictions.co/english/linsoutenable-legerete-du-labeur/working-ourselves-clean/
https://journals.sagepub.com/doi/pdf/10.1177/10242589211022550
http://berlinpolicyjournal.com/the-bottom-forty-percent-have-not-benefited/
https://www.ilo.org/wcmsp5/groups/public/@dgreports/@dcomm/documents/briefingnote/wcms_743146.pdf