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There seems to be a blindspot in sociology for overlapping groups. We used the Clique Percolation Method:

http://angel.elte.hu/cfinder/

that yielded interesting theoretical benefits to specify the significance of structural folding (the overlapping of groups) for entrepreneurial recombination and generative tension. Business groups do tend to overlap a lot, and overlapping groups are better performing, but more unstable. Needless to say, you need a historical dataset to understand what cohesion means (as Simmel, Moreno, and the early theoretical school of network ties clearly saw).

http://www.personal.ceu.hu/staff/Balazs_Vedres/papers/vedres.stark.folds.pdf

This article appears in the January issue of AJS.

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