1. Instituto Complutense de Análisis Económico (ICAE), and Department of Quantitative Economics, Facultad de Ciencias Económicas y Empresariales, Universidad Complutense, Campus de Somosaguas, 28223 Madrid, Spain
2. Department of Economic Analysis and Finance (Area of Financial Economics), Facultad de Ciencias Jurídicas y Sociales, Universidad de Castilla-La Mancha, 45071 Toledo, Spain