
http://www.cesifo-group.de/ifoHome/publications/working-papers/CESifoWP/CESifoWPdetails?wp_num=6448&CESifoWP.search=+

https://publications.parliament.uk/pa/cm201719/cmselect/cmfaff/514/514.pdf

https://www.socialeurope.eu/brexit-shows-us-real-first-world-problems-look-like