...announce a fairly high inflation target over an extended period, and commit to meeting that target.
What am I talking about? Something like a commitment to achieve 5 percent annual inflation over the next 5 years — or, perhaps better, to hit a price level 28 percent higher at the end of 2015 than the level today. (Compounding) Crucially, this target would have to be non-contingent — not something you'll call off if the economy recovers.
~ Paul Krugman, from If I Were