This paper examines Krugman's (1984a) argument that under increasing returns to scale import protection may act as a form of export promotion. We formally prove Krugman's result by explicitly using stability conditions for a multimarket Nash equilibrium. However, if marginal costs were...

This paper examines the stability conditions of Cournot-Nash equilibria in models in which each firm produces multiple outputs in m-related markets. Using a discrete adjustment process, we establish sufficient and necessary conditions for stability. We derive further specialized stability...

Codesharing has become an essential tool for airline alliances. This paper investigates the effects of codesharing on firm conduct and air fares, focusing on oligopolistic interaction between airlines, and measures the impacts of a codesharing agreement between non-market leaders on the market...

This paper explores the possibility that the fortress hubs phenomenon is a consequence of the nature of airline hub-spoke network rivalry with the cost complementarities and economies of traffic density inherent to such networks. A negative network effect of local competition is identified:...