http://ec.europa.eu/epsc/sites/epsc/files/epsc_europe_is_back_trends_jan.pdf
https://www.socialeurope.eu/2017/07/european-welfare-states-perform/
https://blogs.lse.ac.uk/europpblog/2021/07/23/same-legal-status-but-unequal-treatment-bureaucratic-discrimination-against-mobile-eu-citizens/
http://www.bankofengland.co.uk/publications/Documents/inflationreport/2017/aug.pdf