
https://www.etui.org/content/download/36365/365328/file/WP+2019+07-wages-ST-WEB.pdf

https://www.ips-journal.eu/topics/democracy-and-society/german-companies-have-to-ensure-decent-working-conditions-5013/

https://www.brookings.edu/wp-content/uploads/2021/06/Moving-Up.pdf