http://blog.arbeit-wirtschaft.at/mindestlohn-zufriedenere-beschaeftigte/
https://www.strategie.gouv.fr/publications/metiers-2030-perspectives-de-recrutement-region
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef1729en.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/662744/State_of_the_Nation_2017_-_Social_Mobility_in_Great_Britain.pdf