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Multimarket Contact, Merger, and Airline Collusion

This thesis investigates the dynamics of multimarket contact and airline mergers on collusive pricing of airlines. In align with Bernheim and Whinston (1990) and Athey et.al.(2004), it detects collusive pricing via pairwise price difference and price rigidity. The piece of work extends previous work by incorporating additional controls such as distinction between non-stop and stopover itineraries and detailed market concentration measures. The findings confirm a significant relationship between multimarket contact and reduced price differences, indicating collusive equilibria facilitated by frequent interactions across markets. Moreover, the results highlight that airlines exhibit more collusive behavior when pricing non-stop flights, and are more likely to attain tacit collusion when they approaches duopoly in a particular market. The study also explores the effects of airline mergers on collusion, employing an event study methodology with a difference-in-difference (DID) design. It finds no direct evidence that mergers lead to increased collusion among unmerged carriers. However, it reveals that during and after the merger process, carrier pairs between merged and unmerged carriers are more likely to collude compared to pairs of unmerged carriers.

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