For useful comments or discussions, we with to thank Malin Arve, John Bennett, Jérôme Pouyet, Emile Quinet, Zoe Moss and seminar participants at ESNIE (Ajaccio), at the Congrès de l' Association Française d'Economie (Paris-Sorbonne) and at the UBC P3 Project (Vancouver)
Address for Correspondence
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