The global financial crisis gave economists pause for thought about what should be the future of macroeconomic policy. We have devoted much of our thinking to this issue these past three years, including how the many policy instruments work together. The interactions between monetary and macroprudential policies, in particular, remain hotly debated. This topic goes to the core of central banks’ mandates, and their role in achieving macroeconomic and financial stability. While the financial crisis triggered a fundamental rethinking of these issues, much research—both conceptual and empirical—remains to be done. I hope this year’s IMF Annual Research Conference will contribute to expanding the frontier of knowledge on this topic.