Paul Krugman: The Obama Recovery

Suppose that for some reason you decided to start hitting yourself in the head, repeatedly, with a baseball bat. You’d feel pretty bad. Correspondingly, you’d probably feel a lot better if and when you finally stopped. What would that improvement in your condition tell you?

It certainly wouldn’t imply that hitting yourself in the head was a good idea. It would, however, be an indication that the pain you were experiencing wasn’t a reflection of anything fundamentally wrong with your health. Your head wasn’t hurting because you were sick; it was hurting because you kept hitting it with that baseball bat.