Recent innovations in finance, while increasing the capacity to borrow and lend, resulted in a large volume of banking transactions occurring outside of traditional banking institutions. Also, even though existing regulators supervise individual banks for safety and soundness, there are risks that do not reside with those institutions but may still adversely affect the banking system as a whole. Macroprudential policy refers to a variety of tasks designed to defend the broad financial system against threats to its stability. This book provides background and discusses the potential benefits and limitations of macroprudential policy efforts with a focus on systemic risk oversight and reform considerations.