. 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. …

encompasses many economic models with externalities and outside options. We show that when outside options are pure (i …

We study two n-player sequential network formation games with externalities. Link formation is tied to simultaneous … sufficient conditions for efficiency in terms of cyclical monotonicity. The n-player group version always yields efficiency. …

the externalities involved, as well as with where the source of cooperation lies in cooperative game theory. In either … case, the quest for efficiency is claimed to be at the root of cooperation. Next, cooperation is considered from the point …In essence, any international environmental agreement (IEA) implies cooperation of a form or another. The paper seeks …

paid by the winner. We study the impact of these price-externalities on the first-price auction and the second … independently from the identity of the winner. We prove that the first-price auction is not affected by this kind of price-externalities … by the presence of such price-externalities. In any case, in comparison with the first-price auction, the second …