On the relationship between macroprudential policy and other policies

Our note has two related, albeit separate, goals. First, we extend an interest rate policy rule by appending a financial variable to it. Our key assumption is that the relationship between that financial variable and output is uncertain. This is an important assumption because policymakers seek policy rules that are robust to economic relationships. This exercise allows us to discuss a number of issues pertaining to the connection between macroprudential and monetary policies. Second, we examine some of the incentives faced by countries in coordinating their macroprudential policies and, thus, in working towards global financial stability, an international public good. We assume that the probability of a financial crisis decreases as more countries opt for coordination. Moreover, the heterogeneity of expected net benefits implies that countries’ willingness to coordinate differs. While coordination to achieve financial stability faces important challenges, it can be socially optimal.