1. Full Professor, Department of Economics, University of A Coruna (UDC), Campus Elviña s/n, 15071 A Coruña, Spain.
2. Assistant Lecturer, Department of Business, University of A Coruna (UDC), Campus Elviña s/n, 15071 A Coruña, Spain.
3. Full Professor, Department of Applied Economics, University of Santiago de Compostela (USC), Burgo das Nacións s/n, 15782 Santiago de Compostela, Spain.