Building on recent advances in demand estimation for differentiated products, this paper examines the impact of mergers in an industry where the primary dimension of differentiation is geographic. In contrast to previous work, this paper also incorporates the presence of municipally-owned firms...

While several studies have examined the effects of cartels, in few instances are data available that allow us to examine postcartel behavior. In this paper, I use data on interisland airfares to examine the effects of an antitrust immunity agreement that allowed two airlines to coordinate...