This paper presents a dynamic general equilibrium model with sticky prices, in which "inside" money, made out of commercial banks’ liabilities, plays an active, structural role role. It is shown that, in such a model, an inside money shock has a well-defined meaning. A calibrated version of the model is shown to generate small, but non-negligible effects of inside money shocks on output and inflation. I also simulate the effect of a banking crisis in the model. Moreover, I find that it is optimal for monetary policy to react to such shocks, although reacting to inflation alone does not result in a significant welfare loss. JEL Classification: E43.