https://images.transparencycdn.org/images/2019_CPI_Report_EN_200331_141425.pdf
https://www.boeckler.de/pdf/p_wsi_report_52_2019.pdf
https://aclanthology.org/2021.acl-long.4.pdf
https://www.brookings.edu/articles/disquiet-in-the-worlds-middle-class/