Evidence suggests that banks tend to lend a lot during booms, and very little during recessions. We propose a simple explanation for this phenomenon. We show that, instead of dampening productivity shocks, the banking sector tends to exacerbate them, leading to excessive fluctuations of credit,...

This paper integrates banks into a two-sector neoclassical growth model to account for the fact that a fraction of firms relies on banks to finance their investments. There are four major contributions to the literature. First, although banks' leverage amplifies shocks, the endogenous response...