That's a very good point. That is the feeling I have been getting during that past year from Krugman when I started reading his columns. I wanted to read him because of his reputation as an economist, but it is almost like he is parlaying that to push his political agenda.
I'm getting the sense that you haven't really read krugman. For starters, if you did read him on the NYT then you couldn't have missed the giant OPINION label at the top. It's an op-ed, it isn't claiming to be anything else.
Second, if you read the article in question he specifically talks about this particular school of economists using rigorous mathematical models, and the problems he has with those models (in laymans terms). Did you miss that part or did you not read the article in question?
The Fed makes forecasts but monetary policy is based on consensus among various schools of thought, not models. It doesn't work like NOAA.
If you could reliably predict the markets you'd make a fortune -- and the markets would adjust and become unpredictable again. This is a basic feature of markets, agreed to by all comers, last I checked.
IANAE, but I'm hearing over and over again that Krugman is making political points, not economic ones. That's fine, but it makes it difficult for laymen like myself to determine if we're having a political discussion or an economic one.