Page 5 to 11: Benoît Mahy, François Rycx and Mélanie Volral – Introduction | Page 13 to 30: Dries Lens, Ive Marx and Ninke Mussche – Posted work: what is its economic importance in Belgium? | Page 31 to 45: Céline Piton and François Rycx – Is the social elevator broken down for the descendants of immigrants? | Page 47 to 63: Justine Carlier, Maxime Fontaine, Naomé Ide and Ilan Tojerow – Migration and the long-term distribution of the risk of unemployment in Belgium | Page 65 to 75: Valentine Fays, Benoît Mahy and François Rycx – Complementarity-substitutability between native and foreign workers | Page 77 to 93: Ilse Ruyssen and Céline Piton – The effectiveness of integration policies in improving the employment rate of people of foreign origin.