This dissertation includes three chapters on the macroeconomic effects of the financial system, particularly the credit market. In the first chapter, I show a causal link between household credit supply and economic activity using an exogenous shock to household credit supply by Spanish banks in Mexico resulting from macroprudential regulations in Spain. I use the variation in exposure to this shock across Mexican municipalities as a natural experiment and measure the elasticity of lending to the non-tradable sector to changes in household credit ranging from 1.6-3.5. In the second chapter, I show that the Spanish regulations did not affect lending to Mexican firms by Spanish banks. I use firm-level data to show that firms with mult...