TV tune-in, namely the preview of forthcoming programs, is an important type of TV advertising. We examine TV tune-in as a continuous variable. First, tune-in can increase profits when TV stations are sufficiently differentiated and the market is partially covered. Second, tune-in crowds out...

This study offers two new rationales for insufficient entry in a given industry. The first is the presence of complementary industries. Suppose there is free entry in an industry and the complementary industries are monopolistic. If the number of complementary industries is sufficiently high,...

It is common for platforms to have rules for their users to abide. Most times, users of the platform break the rules of the platform, and sometimes they get delisted or removed from the platform. Most platforms own the first party content. To the best of our knowledge, we are the first to study...

For smart phones, most apps and websites use a simplification version of the personal computer version. To the best of our knowledge, we are the first to consider the functionality of apps. We show when the equilibrium functionality is efficient, excessive or insufficient. For the case of...

We propose a framework of utility competition (UC), and we provide the intuition why price competition (PC), quantity competition (QC) and UC differ, and prove it by using a nonlinear demand system. If the network externality is positive, then PC is the most efficient with the lowest equilibrium...

In two-sided markets, instead of joining the platform simultaneously, two groups could join the platform sequentially. Under monopoly, the commitment case is equivalent to the no commitment case. With competing firms, there are two cases to consider. For case 1, if the two groups are...

There are in general three types of fees used by platforms: the fixed membership fee, transaction fee and proportional fee. In real-life, all three fees are used by different platforms. Often, the fee charged by the market maker is a combination of the fixed, transaction and proportional fees....