Jose M. Usategui University of the Basque Country UPV/EHU   Dept. Fund. Analisis Economico II Fac. Economía y Empresa Avda. L. Aguirre, 83 Bilbao, 48015 Spain   josemaria.usategui@ehu.es             JEL Areas: D8 : Information, Knowledge, and Uncertainty: General G1 : General Financial Markets: General (includes Measurement and Data)