This is an Accepted Manuscript of an article published by Taylor & Francis Group in Service Industries Journal on 1/07/2007, available online at:http://www.tandfonline.com/10.1080/02642060701346607The paper has two main objectives. First, to investigate whether workers show significant differences in labour opportunities. Second, to test the hypothesis that tertiarisation has important effects explaining it. The hypotheses are: (1) tertiarisation has relevant effects on the structure of labour demand by skills; (2) the labour opportunities of workers can be influenced by the skills developed in their previous jobs and their concordance between sectoral changes. From a methodological point of view, the approach implies a study of labo...