Do financial intermediaries influence firms’ (real and financial) outcomes? Are there interactions with monetary and macroprudential policy? This thesis tackles those questions from multiple perspectives. The first chapter asks whether monetary policy shocks alter the maturity structure of US corporate debt. I find that looser monetary conditions lengthen non-financial firms’ debt maturity, especially among very big corporations and driven by increased risk-taking by bond-market investors. The second and third chapter analyze the effects of prudential capital controls on corporate debt and real outcomes, looking at the recent experience of Colombia. Capital controls are shown to reduce corporate debt during a boom - either directly, or indi...