https://docs.iza.org/dp16728.pdf
https://www.project-syndicate.org/commentary/g20-solutions-to-ending-inequality-by-helle-thorning-schmidt-2017-07
https://www.opendemocracy.net/uk/looking-at-lexit/guy-aitchison/borders-open-borders-or-no-borders?utm_source=Daily+Newsletter&utm_campaign=0a51e05bcc-DAILY_NEWSLETTER_MAILCHIMP&utm_medium=email&utm_term=0_717bc5d86d-0a51e05bcc-407405485
http://uk.reuters.com/article/uk-britain-eu-immigration-idUKKBN18L0XG