“…Andreou et al, 2016), we estimate risk-return efficiency, hereafter RRE, because Koetter (2008) and Hughes et al (1996) argue that efficiency estimates control insufficiently for bank risk and may be misleading especially when risk preferences differ. We follow banking efficiency studies (i.e., Hughes et al, 1996;Hughes, Mester, and Moon, 2001;Koetter, 2008;Andreou et al, 2016), and choose the stochastic frontier analysis (SFA) to estimate the RRE frontier. Then, we use the intuition by Demerjian et al (2012) to parse out managerial ability from full efficiency.…”