1 Department of Economic Analysis and Finance, Faculty of Economic and Business Sciences, University of Castilla-La Mancha, Albacete 02071, Spain; and luis.lsantiago@uclm.es.
2 IN+, Center for Innovation, Technology, and Policy Research, Energy and Environment Scientific Area, Department of Mechanical Engineering, Instituto Superior Técnico, University of Lisbon, 1049-001 Lisbon, Portugal.
3 Department of Economic Analysis and Finance, Faculty of Economic and Business Sciences, University of Castilla-La Mancha, Albacete 02071, Spain; and.