https://www.dw.com/en/germanys-economic-time-bomb-the-labor-crisis/a-65522919
http://www.bsa.natcen.ac.uk/latest-report/british-social-attitudes-34/key-findings/context.aspx?_ga=2.25464057.552181158.1498632950-1412959047.1496247036
https://www.boeckler.de/pdf/p_imk_report_125e_2017.pdf
http://berlinpolicyjournal.com/the-bottom-forty-percent-have-not-benefited/