Jenny De Freitas Universitat de les Illes Balears   University of the Balearic Islands Department of Applied Economics Cra. de Valldemossa, km 7.5 Palma, 07122 Spain   jenny.defreitas@uib.es   http://www.uib.es/depart/deaweb/webpersonal/jdefreitas/           JEL Areas: L : Industrial Organization Q5 : Environmental Economics: General