Very good interview with Kevin Murphy of the University of Chicago. His turbo micro course was one of the few I regret not having time or opportunity to take while at the GSB.
Actually, there are a couple of basic mistakes in the economics in the interview...the Pythagorean Theorem answer, for one. The fundamental issue with informational products is not that someone can or cannot make a living teaching you about them, but that they themselves are non-rival, and thus not consumed in the same manner as material, rival goods.
More: Brad Delong has a relevant post up on the impact of politics on quality control among economists.