https://www.socialeurope.eu/2017/06/trade-unions-and-the-decline-of-social-democracy/
http://www.inegalites.fr/spip.php?page=analyse&id_article=2289&id_rubrique=64&id_mot=30&id_groupe=9
http://uk.businessinsider.com/unemployment-in-the-uk-is-now-so-low-its-in-danger-of-exposing-the-lie-used-to-create-the-numbers-2017-7?r=US&IR=T