Explaining the Puzzling Behavior of Short-Term Money Market Rates
Since 2008, the Federal Reserve has dramatically increased the supply of bank reserves, effectively adopting a floor system for monetary policy implementation. Since then, the behavior of short-term money market rates has been at times puzzling. In particular, short-term rates have been surprisingly firm in recent months, despite the large increase in reserves by the Fed as a part of its response to the coronavirus pandemic. In this post, we provide evidence that both the supply of reserves and the supply of short-term Treasury securities are important factors for explaining short-term rates.