My mental model of Krugman is that he used to be smart scientist and then (I think consciously) decided that agitprop is really really important and that he will do more good by being a frontline fighter in ideological wars rather than a chief alchemist of an ivory tower. Unfortunately Krugman's assumed role is not compatible with being a smart scientist...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.