Fabian Berges UMR GREMAQ-INRA   Bureau MF 327 Manufacture des Tabacs 21 Allée de Brienne Toulouse, F-31000 FRANCE   Fabian.Berges@toulouse.inra.fr   http://www-gremaq.univ-tlse1.fr/page_perso.php?lang=en&user=fberges           JEL Areas: L1 : Market Structure, Firm Strategy, and Market Performance: General Q : Agricultural and Natural Resource Economics