First Author:   Marie-Sophie Hervieux LEMNA, University of Nantes marie-sophie.hervieux@univ-nantes.fr   IEMN IAE, Chemin de la Censive du Tertre, BP 52231 nantes, 44322, France   +(33)02 40 14 17 31.(Phone) +(33)02 40 14 17 31.(Fax) Second Author: Olivier Darné LEMNA, University of Nantes Olivier.darne@univ-nantes.fr   Nantes, 44322, France