María del Carmen Sánchez-Carreira, PhD, is Associate Professor of Applied Economics at the University of Santiago de Compostela, Galicia, Spain. Paulo Jorge Reis Mourão, PhD, is Associate Professor at the Department of Economics, the University of Minho, Braga, Portugal. Bruno Blanco-Varela,PhD, is Associate Professor of Applied Economics at the University of Santiago de Compostela, Galicia, Spain.