We investigate the role of networks of military alliances in preventing or encouraging wars between groups of countries …, we show that there do not exist any networks that are stable against the addition and deletion of alliances. We then show … that economic benefits from international trade can provide incentives to form alliances in ways that restore stability and …

We develop a two-stage game in which competing airlines first choose the networks of markets to serve in the first … model using data from the domestic US airline market and find significant spillovers in entry. In a counterfactual exercise …, we evaluate the 2013 merger between Amer- ican Airlines and US Airways. Our results highlight that spillovers in entry …

insignificant. -- competition for the market ; liberalization ; passenger railways ; procurement auctions …