Facebook and Google and other internet giants are multisided markets (MSM). The user-side of the market, prices are zero - "free." On the other side of the market, Facebook's and Google's revenues are derived from advertising which appears when the users click on advertisers' web sites. They can...

The internet giants - Facebook, Amazon, Netflix and Google, among others - have transformed society with both positive and negative effects. The negative effects have been stark. There have been huge disruptions caused by e-commerce. More recently, subtler, but even more serious negative effects...

This paper considers a model of two interconnected networks with different qualities. There are call externalities in the sense that consumers value calls they send and receive. Networks compete in two part tariffs. We show that call externalities create private incentives for each competitor to...