Since the seminal contribution of Jackson & Wolinsky 1996 [A Strategic Model of Social and Economic Networks, JET 71 …, 44-74] it has been widely acknowledged that the formation of social networks exhibits a general conflict between … results that relate situations of positive externalities with stable networks that cannot be 'too dense' in a well …

and the implications for the structure of pairwise stable networks. First, different definitions of convexity (concavity … own links and strategic complements, a local uniqueness property of pairwise stable networks is derived. The results do …

into account the potential externalities networks produce. Once social ties are in place, these externalities shape the … norms are easily sustained in symmetric networks. By contrast, when an efficient interaction requires players to play …

chances of getting infected but also our entire network. We introduce a model for coalitional network stability in networks …; this simple setting also models economic situations such as airline networks. The second models social contacts during an …

future choices. These considerations motivate a rich research programme on how social networks shape individual and …

individuals exchanging favors have a common friend. In symmetric settings, such robust networks are "social quilts": tree …-like unions of completely connected subnetworks. Examining favor exchange networks in 75 villages in rural India, we find high …