“…Efficiency outcomes could be heavily influenced by the characteristics of the merged banks and the economic environment of the country during examination period (Vander Vennet, 1996;Lin, 2005;Resti, 1998;Avkiran, 1999;Drake and Hall, 2003). For example, Avkiran (1999) Efficiency studies of financial liberalization and deregulation generally confirmed obvious positive effects, as high as 25% in Canhoto and Dermine's study of Portugal banks during the deregulation period of 1990 to 1995 (Berg et at., 1992;Zaim, 1995;Chen, 2001;Canhoto and Dermine, 2003;Girardone et al, 2004;Sturm and Williams, 2004). It was consistent with the expectations that a more competitive system would lead to efficiency improvement as banks strived to cut costs and increase profitability.…”