In this paper we assess the empirical performance of commonly used empirical specifications of the baseline New Keynesian model for the US and the euro area. We estimate standard specifications of the model and extended specifications also including non-standard determinants of aggregate supply and demand. The results suggest that based on the standard specifications it is often not possible to establish a significant link between the monetary policy instrument and output and inflation. Based on the extended specifications of the model, which take into account the significant effect of commodity prices on inflation and of house prices on the output gap, we are generally able to restore a significant monetary transmission channel. (JEL E3, E52, C22)
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