Hellmann, Tim; Buechel, Berno - Fondazione ENI Enrico Mattei (FEEM) - 2009
. We approach this omission by analyzing the role of positive and negative externalities of link formation. This yields … general results that relate situations of positive externalities with stable networks that cannot be “too dense” in a well …-defined sense, while situations with negative externalities tend to induce “too dense” networks. …