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We published a paper on this exact subject in the American Journal of Sociology this past summer. It's called "The Diversity-Bandwidth Tradeoff" and you can find it here:
If you don't have access to AJS, a pre-print can be found here:
Assistant Professor, NYU Stern School of Business.
Research Affiliate, MIT Sloan School of Management.
Personal Webpage: http://pages.stern.nyu.edu/~saral
SSRN Page: http://ssrn.com/author=110270
WIN Workshop: http://www.winworkshop.net
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