https://www.eurofound.europa.eu/sites/default/files/wpef17037.pdf
https://www.cesifo-group.de/DocDL/ifoDD_18-01_03-09_Ochsner.pdf
http://www.cityam.com/259289/tony-blairs-brexit-open-britain-speech-full
https://cps.org.uk/wp-content/uploads/2021/09/210918224828-CPSWELFAREPAPER1.pdf