Galbraith On Sociology Of Economics

I thought this short comment was interesting:

Figure 1: James Galbraith on Sociology of Economics

Provenance is, of course, no guarantee of the quality of art. But one thing that strikes me about dissenters and non-mainstream economists is that many have doctorates in economics from elite schools (e.g., Harvard, Yale, Cambridge), have taught at such elite schools, or might even be professors at such places. Is there any other discipline in which members treated as on the fringe have so many with such credentials?