“…Nonetheless, in this paper's case, the cointegrability property of these returns has decreased in the European Monetary System, perhaps due to changes within the exchange rate mechanism (like the widening of the fluctuation bands from F2.25% in the 1980s to F15% in the early 1990s), or to the gradual process of convergence of the interest rates of individual EMS countries (with that of Germany's), a process that makes the cointegrating relationship variant over time (see Caporale & Pittis, 1993;Hassapis, Pittis, & Prodromides, 1999). Finally, other authors (Bajo-Rubio, Sosvilla-Rivero, & Fernandez-Rodriguez, 2001) found some evidence of cointegration among some EMS members but not with others.…”