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There seems to be a blindspot in sociology for overlapping groups. We used the Clique Percolation Method:
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).
This article appears in the January issue of AJS.
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