"We had to throw out our textbook descriptions of how monetary policy is implemented after the fall of 2008, as the Fed turned from its traditional tools to active use of large-scale asset purchases. A number of studies have now been conducted of the potential efficacy of these new policy tools. I surveyed some of the new studies last October. Today I'd like to discuss three new papers that have come out since then.
Let me begin with a little background. Prior to the fall of 2008, the focus of monetary policy was to choose a target for the fed funds rate, which is the interest rate banks charge each other for overnight loans of Federal Reserve deposits. In normal times, this rate was extremely sensitive to the quantity of those deposits created by the Fed, enabling the Fed to achieve its target for the fed funds rate with relatively modest additions or withdrawals of reserves. But by the end of 2008, the Fed had driven the fed funds rate essentially to zero and began paying interest on reserves. Since then, banks have been content to hold an arbitrarily large amount of excess reserves, and the overnight rate has been as low as it could go. In other words, the traditional tools of monetary policy have become completely irrelevant in the current setting..."
at http://www.econbrowser.com/archives/2011/01/the_feds_new_po.html
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