One of the chief ways financial market participants make sense of events is by drawing parallels with the past. The subprime crisis, when it first erupted, was widely perceived as the most dangerous financial crisis since the 1930s. The implication was that it was critical to avoid the policy mistakes that transformed that earlier crisis into a macro­economic disaster. The lesson drawn was that it was important to avoid an excessively tight monetary policy.

Now, with inflation rising, the popular parallel is not the deflationary 1930s but the stagflationary 1970s. Again the implication is that it is important for policymakers to avoid past mistakes. In this case past mistakes mean a monetary policy that allows inflation expectations to become unanchored.