... service in network i (whichdiffers with i because of service quality), and ciis the cost of service provisioning in this par-ticular network. Now, the discount dijoffered by network j may ... extremely significant. A provider can make significant profits from lock-in and network externalities, and so may seek to grow his network rapidly in order to obtain a large customerbase. Since lock-in ... provided by networks i and j, and the third term is the present value of thedifference in their operating costs. Observe that if the quality difference equals the costdifference, then networks...