Juliana Caicedo-Llano Université d'Evry-val-d'Essone   25, Rue de Saint Ambroise Paris, 75011 France   juliana.caicedo@univ-evry.fr   http://economix.u-paris10.fr/en/membres/index.php?id=306           JEL Areas: G1 : General Financial Markets: General (includes Measurement and Data) C4 : Econometric and Statistical Methods: Special Topics