He did pose questions that even the born-again institutionalist in him . . .
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Actually Stiglitz' present posture is not a radical departure from his work, IMO, which has always used neo-classical methods to demonstrate basic problems in the nostrums founded on a narrow application of neo-classical theory. The main difference I would say is his transition from theoretical to applied, and from academia to the outside world, leading naturally to an explicit political role.
If all academics had his theoretical vision, the profession would look radically different from its present incarnation.
mbs