https://frictions.co/english/linsoutenable-legerete-du-labeur/working-ourselves-clean/
http://uk.reuters.com/article/uk-ecb-policy-draghi-idUKKBN19H1Z7?utm_source=POLITICO.EU&utm_campaign=b1a85f2c23-EMAIL_CAMPAIGN_2017_06_27&utm_medium=email&utm_term=0_10959edeb5-b1a85f2c23-189647205
https://www.bloomberg.com/news/features/2021-09-02/food-prices-driven-up-by-global-worker-shortage-brexit
http://invs.santepubliquefrance.fr/publications/etat_sante_2017/ESP2017_Ouvrage_complet_vdef.pdf