Antitrust investigations in the mobile app economy often require a definition of the relevant
market of mobile apps and the evaluation of their market power. However, existing antitrust …

The mobile application (app) economy comprises two distinct platform markets through
which app developers earn revenues: app platform and ad platform markets. App sales are …

Apps compete for limited user time regardless of their functions. I develop a discrete-
continuous demand model with a binding time constraint. I estimate the model on three pairs …