https://www.ceps.eu/system/files/CEPS%20-%20LINKEDIN%20study%20FINAL.pdf
http://www.etui.org/Publications2/Working-Papers/Why-central-and-eastern-Europe-needs-a-pay-rise
https://www.washingtonpost.com/outlook/after-200000-years-were-still-trying-to-figure-out-what-humanity-is-all-about/2021/11/23/2b29ff86-4bc8-11ec-b0b0-766bbbe79347_story.html
https://pubs.aeaweb.org/doi/pdfplus/10.1257/jep.34.4.105