Non-aeronautical revenues have been recently gaining importance for airports around the world. Retailing as part of this revenue stream has become the fastest growing component of airport revenue and profit. The airports have developed different contractual relationships to administer their retailer activities, aiming at maximizing their retail revenues. The investigation of factors that drive these revenues has become a focus of a number of empirical papers. The focus of this project is on understanding airport-retailer relationships and investigating their pro-competitive and anti-competitive effects. This issue has not been investigated either conceptually or empirically.