NB: This version of Working Paper 6 (updated on 14 Mar 2019) replaces the previous version uploaded in September 2018. Please disregard the earlier version you have downloaded.
Dr Elisabet Weedon (CREID, University of Edinburgh), Dr Fernando Lezcano Barbero (EDINTEC, University of Burgos) and Dr Raquel Casado Muñoz (EDINTEC, University of Burgos)