http://www.ilo.org/wcmsp5/groups/public/—ed_protect/—soc_sec/documents/publication/wcms_614324.pdf
https://www.oecd-ilibrary.org/docserver/467cf791-en.pdf?expires=1687844142&id=id&accname=guest&checksum=E3DB362DEFB5526E94E4B65C66C86AFD
https://capx.co/why-britains-north-south-divide-has-more-to-with-william-the-conqueror-than-margaret-thatcher/?utm_source=newsletter&utm_medium=email&utm_campaign=14%2F10%2F2021++
https://www.inet.ox.ac.uk/files/Supply-Demand-Shocks-CEPR-Apr-17-2020.pdf