This paper analyzes interest rate spreads and margins in banking in Bangladesh for the period 1990-2008. The application of the Arellano-Bover/Blundell-Bond dynamic panel regression model to a panel of 43 banks for the period 1990-2008 reveals persistency in interest spreads and margins. The model also identifies that high administrative costs, high non-performing loan ratio and some macroeconomic factors are the key determinants of persistently high interest rate spreads and margins. Persistently high spreads and margins in old private banks (established before 1999) are attributed to a certain degree of market power in the post-liberalization period (after 1999). These factors together imply a lack of competition and efficiency in the banking sector of Bangladesh despite financial reforms.JEL Classification: G21, G30, O16

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