David Pérez Gustavo (Valladolid, 1980). B.Sc. in Economics (Universiy of Valladolid), M.A. in Economics (University of Georgia, USA). He worked as an economics instructor at Athens Technical College (USA). He is currently enrolled as a PhD candidate in Economics at Universidad de Valladolid. He is a member of Grupo de Energía, Economía y Dinámica de Sistemas (GEEDS) at Universidad de Valladolid.