We conduct a systematic analysis of the costs and benefits of large-scale securities purchases, using the Federal Reserve's QE4 program as a concrete example. This program was initiated at the onset of the pandemic in March 2020 and continued for two years, leading to a doubling of the Fed's...

This paper takes a new approach to assess the costs and benefits of using different policy tools-macroprudential, monetary, foreign exchange interventions, and capital flow management-in response to changes in financial conditions. The approach evaluates net benefits of policies using quadratic...