Monetary policy: Bernanke needs new weapons

The Federal Reserve has not made explicit its embrace of quantitative easing or said that it is abandoning the nominal federal funds rate as its main policy instrument. But it is injecting huge volumes of extremely low-cost, short-term cash into the banking system. While the official federal funds rate stood at 1% last month, the actual rate at which banks received overnight federal funds was closer to 0.3%, as the Fed’s balance sheet ballooned from $800 billion in late September to more than $2.4