“…Their main objective is to determine the time tendencies of their trends, the sense of their causality, the degree of their cointegration and then the coupling problem (Meersman et Van De Voorde, 1999;Kulshreshtha et al, 1999;Stead, 2001;Banister and Stead, 2003;Léonardi et Baumgartner, 2004;Tanczos et Torok, 2007).…”