“…Differences in bank organisational structures, for instance, in terms of their ownership might explain variations in X-inefficiencies because of principal-agent problems that offset the conditioning effect that environmental pressure brings to bear on managerial effort. 1 This is an empirical issue, which has received considerable attention in the bank efficiency literature albeit yielding somewhat mixed or inconclusive results (see Verbrugge and Goldstein, 1981;Verbrugge and Jahera, 1981;Cebenoyan et al, 1993;Mester, 1993;Berger and Humphrey, 1997;Cummins and Zi, 1998;Altunbas et al, 2001). One limitation of the bank ownership-efficiency literature is that, in general, it simply determines whether banks organised under one ownership model are significantly more efficient than banks organised in another way.…”