https://www.brookings.edu/wp-content/uploads/2021/06/Moving-Up.pdf
https://www.wsi.de/fpdf/HBS-008657/p_wsi_report_86e_2023.pdf
https://www.bruegel.org/wp-content/uploads/2021/05/PC-2021-11-ecofin-210521.pdf
http://economics.mit.edu/files/12979