The credit channel literature has made great strides in recent years, however, much of the literature to date has focused largely on the closed economy. Even some of the literatures are in a framework of an open economy, they only concentrate on the fixed or a quasi-fixed exchange rate regime. Therefore, the aim of this paper is to complete the theoretical framework by extending the Bernanke and Blinder model to the case of an open economy under a floating exchange rate regime. We find that the exchange rates puzzle takes place in our model when the influence from credit channels is very significant. We further to compare the credit channel effects under different models. Moreover, we adopt a cointegration analysis to study the credit channel effect, and the empirical evidences show that the credit channels exist in Taiwan for the sample period during November 1991 to January 2005.

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