Back in March 2011, Randolph Azarov, also known as The Raven, posted a comment on a Virtually Speaking episode featuring UC-Berkeley Economics Professor Brad DeLong. Brad recently referred to that comment, and Paul Krugman picked it up. Interestingly enough, this led to a fair amount of discussion among different members of the New Classical vs New Keynsian advocates.  Steve Williamson chimed in  Noah Smith rings some more changes.  (There are several links in that post you should click through to. And read the updates.)  Brad's Reply.