Paul Krugman has a response up to Alex and Tyler that is quite good. I have to say I was personally a little surprised that both Alex and Tyler wrote what they did, because usually they don't play the Krugman attack game like a lot of people do. Usually the critics are frustrating because they're so numerous, but fairly transparent. It's almost exclusively the biggest bullies in the blogosphere that complain about Krugman being a bully. But this was a little different.