José Luis Rodríguez-gómez Universidade da Coruña (University of A Coruna)   Campus de Elviña s/n Facultad Economía y Empresa A Coruña, A Coruña 15071 España   jose.luis.rodriguez.gomez@udc.es             JEL Areas: G1 : General Financial Markets: General (includes Measurement and Data) E3 : Prices, Business Fluctuations, and Cycles: General (includes Measurement and Data)