Clemence Christin Normandie Université, UCBN, CREM-UMR CNRS 6211   UFR SEG Université de Caen Basse-Normandie 19 Rue Claude Bloch CAEN, 14000 FRANCE   clemence.christin@unicaen.fr             JEL Areas: L1 : Market Structure, Firm Strategy, and Market Performance: General Q5 : Environmental Economics: General