“…Most studies on banks' efficiency (Altunbas¸, Gardener, Molyneux, and Moore, 2001;Berger, 1995;Berger and Humphrey, 1997;Berger and Mester, 1997;Bos and Schmiedel, 2007;Goddard, Molyneux, and Wilson, 2001;Maudos, Pastor, Pérez, and Quesada, 2002;Schure, Wagenvoort, and O'Brien, 2004;Williams, Peypoch and Barros, 2009) focus on the US and Europe and neglect banks in emerging countries such as Nigeria. Multi-country analysis usually considers factors such as legal tradition, accounting conventions, regulatory structures, property rights, culture and religion as possible explanations for cross-border variations in financial development and economic growth (Beck, Demirgüc¸-K, and Levine, 2003;Beck and Levine, 2004;La Porta, Lopez-de-Silanes, Shleifer, and Vishny, 1997;Levine, 2003;Stulz and Williamson, 2003).…”