The success over the years in reducing inflation and, consequently, the average level of nominal interest rates has increased the likelihood that the nominal policy interest rate may become constrained by the zero lower bound. When that happens, a central bank can no longer stimulate aggregate...

As recently as early 1994, market participants had to infer the stance of U.S. monetary policy according to the type and size of the open market operations conducted by the Federal Reserve's Trading Desk. Thus, investors were exposed to uncertainty about both the timing and the motivation for...