Generally, bank size is proved to have a positive impact on bank profitability to a certain extent. However, for emerging markets like Vietnam, the effect of growing size on profitability might be negative due to management, bureaucratic and other reasons. Pasiouras & Kosmidou (2007) confirm a positive and significant relationship between the size and the profitability of a bank. This is because larger banks are likely to have a higher degree of product and loan diversification than smaller banks, and because they should benefit from economies of scale. Other authors, such as Berger et al. (1987), provide evidence that costs are reduced only slightly by increasing the size of a bank and that very large banks often encounter scale inefficiencies. Micco et al. (2007) find no correlation between the relative bank size and the ROAA for banks, i.e. the coefficient is always positive but never statistically significant. Naceur & Omran (2011) state that bank-specific characteristics, in particular bank capitalization and credit risk, have a positive and significant impact on banks' net interest margin, cost efficiency, and profitability. We use logarithm of the total asset to proxy for bank size and expect that bank size has a positive impact on bank profitability.
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