This paper (1) presents a general model of online price competition, (2) shows how to structurally estimate the underlying parameters of the model when the number of competing firms is unknown or in dispute, (3) estimates these parameters based on UK data for personal digital assistants, and (4)...

Increasingly, lobbying groups are subject to transparency requirements, obliging them to provide detailed information about their business. We study the effect this transparency policy has on the nature of lobbying competition. Under mild conditions, mandated transparency leads to an increase in...