Key points are not available for this paper at this time.
Martin Ruef, Howard E. Aldrich, Nancy M. Carter, The Structure of Founding Teams: Homophily, Strong Ties, and Isolation among U.S. Entrepreneurs, American Sociological Review, Vol. 68, No. 2 (Apr., 2003), pp. 195-222
Ruef et al. (2003) studied this question.
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