The aim of the Discussion Papers on Economic Behaviour (DPEB) series is to serve as first vehicle to disseminate the research carried out by ERI-CES researchers and other external researchers. Articles undergo an internal refereeing process under the responsibility Juan A. Máñez , the DBEP editor. All researchers working (or visiting) at ERI-CES are eligible to be referee. You are welcome to suggest the name of the referee. The refereeing process consists of a short report by the referee, followed by the author reply following the indications of the referee. PDF files must include all fonts and should not require supplemental files for figures. Papers are submitted via Juan A. Máñez.