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See Cass R. Sunstein - Why Societies Need Dissent<ref>[http://papers.ssrn.com/sol3/papers.cfm?abstract_id=441340 Sunstein, Cass R., Why Societies Need Dissent. Sunstein, Cass R., WHY SOCIETIES NEED DISSENT, Harvard University Press, September 2003]</ref>
Also in [http://en.wikipedia.org/wiki/Group_polarization wikipedia]