Sana Ben kebaier University of Paris Dauphine, Department of Econmics, LEDa (CGEMP)   office C104 University of Paris Dauphine Place Marichal de Lattre De Tassigny Paris, 75016 France   sana.ben-kebaier@dauphine.eu             JEL Areas: Q4 : Energy: General F0 : International Economics: General