Krugman's Record on Economic Predictions

The key things here--for me at least--is that Paul Krugman has not only been right about these important issues, but that he has a theory that explains why he's been right. The other side has tried to use proof by assertion and denial of the facts to support their case. Theory allows us to explain why things happened the way they did and helps us predict the outcomes for various policies. If you don't have a workable theory, you are just making assertions (emphatic guesses).