David Reilly says the Fed's response to the large volatility in the stock market after the credit downgrade of the U.S. to AA+ makes sense. The Fed's Open Market Committee voted 7-3 on August 9, 2011, to keep interest rates exceptionally low till mid-2013. With credit markets working and the financial system having sufficient liquidity the Fed did not need to take drastic action. Coming only a short period after the end of QE II, a QE III could be seen as an over-reaction. Another reason for the Fed's action- more pressure was needed for the U.S. government and Congress to shoulder responsibility for the economy. In an earlier statement the Fed had pointed out that the Fed by itself can only do so much and this is consistent with that thinking. There are important headwinds from housing, large consumer debt, deficits, and high unemployment that the Fed alluded to in that statement that will take time to reverse with policy action on several fronts over a longer period. In the speech made on June 6, 2011, U.S. Federal Reserve chairman, Ben Bernanke, said "monetary policy cannot be a panacea."...