Monetary policy decisions tend to regress toward the mean and to be inertial—and hence biased in just the same way that adaptive expectations are bia… - Alan Blinder

The word ‘Keynesian’ means many things to many people. Decades ago, it was a carelessly applied label for economic liberals and interventionists in general. For a while in the late 1970s and early 1980s it became a pejorative term more or less synonymous with old-fashioned.

In central banking circles, it is viewed as obvious that the accumulation and destruction of reputational capital more closely resembles adaptive than rational expectations — it lags behind reality. Here, I think, the central bankers are closer to the truth than the economic theorists.

Keynesian economics is the economics of nominal rigidities basically, nominal rigidities everywhere. Fully anticipated money does affect output. Everybody can see that! So, it's right. The fact that it's not as theoretically tidy as Lucas's 1972 Journal of Economic Theory paper is not a reason to throw it away. That's become a minority view in this profession, unfortunately. It wouldn't have been in the '60s.