So I am skeptical about the argument that the subprime mortgage problem will contaminate the whole mortgage market, that housing construction will come to a halt, and that the economy will slip into a recession. Every step in this chain is questionable and none has been quantified. If we have learned anything from the past 20 years it is that there is a lot of stability built into the real economy.

To me, inflation targeting at its best is an application of Milton Friedman's maxim that "inflation is always and everywhere a monetary phenomenon," and its corollary that monetary policy should concentrate on the one thing it can do well -- control inflation. It can be hard to keep this in mind in financially chaotic times, but I think it is worth a try.