Oversight of the Federal Reserve's (Fed's) monetary policy decisions rests with Congress. But oversight is encumbered by the absence of a straightforward relationship between interest rates and economic performance. Further, the Fed's policy decisions are discretionary, meaning there is no objective, transparent “yardstick” for evaluating their decisions. A simple rule of thumb guide to monetary policy decisions called a “Taylor rule” is an intuitive way to judge actual policy against some objective, albeit simplistic, ideal. Taylor rules prescribe a federal funds target based on inflation and the output gap (i.e., the difference between actual gross domestic product [GDP] and potential GDP) and can be adjusted to reflect a variety of policy goals.