Online platforms, such as Google, Facebook, or Amazon, are constantly expanding their activities, while increasing the overlap in their service offering. In this paper, we study the scope and overlap of online platforms' activities, when they are endogenously determined. We model an expansion...

We consider a heretofore unexplored explanation for why platforms, such as Internet service providers, might impose download limits on content consumers: doing so increases the degree to which those consumers view content providers products as substitutes. This, in turn, intensifies competition...

We consider a heretofore unexplored explanation for why platforms, such as Internet service providers and mobile-phone networks, offer plans with download limits: through one of two mechanisms, doing so causes the providers of the content consumer purchase to either reduce their prices or...

We consider a heretofore unexplored explanation for why platforms, such as Internet service providers and mobile-phone networks, offer plans with download limits: through one of two mechanisms, doing so causes the providers of the content consumer purchase to either reduce their prices or...

We discuss the formation of technical standards platforms in industries with network externalities where firms are free to choose their degree of technical compatibility with competitors. In our model, firms choose affiliation to a technical standards coalition in the first stage of a game, and...

We consider a two-sided market competition problem where two platforms compete in both supply and demand sides. We examine a variety of competition modes and study the impact of precommitment on the equilibrium outcomes. By comparing three types of competitions: simultaneous price and wage...

We customize the aggregative game approach to oligopoly to study asymmetric media markets. Advertiser, platform, and consumer surplus are tied together by a simple summary statistic. When media are ad-financed and ads are a nuisance to consumers we establish see-saws between consumers and...