In responding to the extremely weak global economy after the financial crisis in 2008, many industrial nations have been considering or have already implemented negative nominal interest rate policy. This situation raises two important questions for monetary theories: (i) Given the widely held...

This paper critically evaluates the literature on international unconventional monetary policies. We begin by reviewing the theories of how such heterogeneous policies could work. Empirically, event studies provide compelling evidence that international asset purchase announcements have strongly...