Motivated by recent UK experience, we study the problem of mobile call termination. This is an intriguing policy story, in which regulation has been imposed on what appears to be a competitive industry. We introduce a framework which integrates two existing literatures: one analyzing...

We provide a framework for analyzing two-sided markets that allows for different degrees of product differentiation on each side of the market. When platforms are viewed as homogenous by sellers but heterogeneous by buyers, we show that competitive bottlenecks arise endogenously. In equilibrium,...

We provide a framework for analyzing two-sided markets that allows for different degrees of product differentiation on each side of the market. When platforms are viewed as homogenous by sellers but heterogeneous by buyers, we show that competitive bottlenecks arise endogenously. In equilibrium,...

We discuss the regulation of a multiproduct monopolist when the firm has private information about cost or demand conditions. The regulator offers the firm a set of prices from which to choose. When there is private information only about costs, the firm should always have a degree of discretion...

We model firms as supplying utility directly to consumers. The equilibrium outcome of competition in utility space depends on the relationship pi(u) between profit and average utility per consumer. Public policy constraints on the "deals" firms may offer affect equilibrium outcomes via their...