From John Taylor's Economics One blog:
A few weeks ago Paul Ryan and I wrote an article proposing changes in the Federal Reserve Act. One change would require the Fed to focus on "the single goal of long-run price stability within a clear framework of overall economic stability.” Since then some have argued that changing the dual mandate in this way would not have prevented the recent highly discretionary monetary policy, which, in my view, has on balance been counterproductive. For example, Greg Mankiw writes on his blog that “If the Fed's mandate were different, monetary policy today might well be the same. That is, with inflation now below its target, the Fed could be pursuing QE2 even if it were operating under the proposed mono mandate.” Similarly, in today’s Wall Street Journal Marc Sumerlin writes that such a change would “actually be supportive of the Fed’s current program.”Yes, that John Taylor. He of the Taylor Rule, recipient of the Bradley Prize, etc.
But there are several reasons to believe that QE2 would not have happened had Fed officials not been able to refer to a dual mandate in the Federal Reserve Act as justification for the intervention. First consider this bit of emprical evidence: There have never been so many references to the dual mandate by Fed officials as in the past year or so. If the dual mandate was not a factor in justifying and embarking on QE2, then why did Fed officials find the need to refer to it so much as justification for QE2 in the past year? In contrast, during the 1980s and 1990s, Federal Reserve officials rarely referred to the dual mandate (even in the early 1980s when unemployment was higher than today), and when they did so it was to make the point that achieving the goal of price stability was the surest way for monetary policy to keep unemployment down. Now, as Paul Ryan and I put it, “Advocates of aggressive Fed interventions cite the ‘maximum employment’ aspect of the Fed’s dual mandate.”...MORE