Open-economy macroeconomics with financial frictions: A simple model with flexible exchange rates

A simple macroeconomic model with banking, financial frictions, and flexible exchange rates is used to study the performance of fiscal, monetary and macroprudential policy combinations in response to domestic and external shocks. After characterizing the transmission process of each instrument, a diagrammatic analysis of how these policies should be used, either individually or jointly, to promote economic and financial stability, is provided. The analysis shows that whether a policy should be assigned to internal or external balance, and whether it should be contractionary or expansionary, depends not only on the nature of the shocks impinging on the economy but also on the range of tools available to policymakers and the strength of financial frictions. In particular, in response to an external financial shock, monetary policy should be assigned to external balance, and fiscal policy or macroprudential regulation to internal balance. These two policies are substitutes when used in combination with monetary policy.