We analyze the impact of mandatory access on the infrastructure investments of two competing communications networks, and show that for low (high) access charges firms wait (preempt each other). Contrary to previous results, under preemption a higher access charge can delay first investment....

We analyze competition between vertically integrated infrastructure operators that provide access in different geographical areas. A regulator may impose a uniform access price, set local access rates, or deregulate access locally. We analyze the impact of these alternative regulatory regimes on...

Often, fixed-line incumbents also own the largest mobile network. We consider the effect of this joint ownership on market outcomes. Our model predicts that while fixed-to-mobile call prices to the integrated mobile network are more efficient than under separation, those to rival mobile networks...

We investigate cooperative investment for the deployment of a new infrastructure, and how it interacts with access obligations and demand uncertainty. Co-investment increases total coverage only if service differentiation and/or cost savings from joint investment, in particular due to high...

The differential between on-net and off-net prices, for example on mobile telephony networks, is an issue that is hotly debated between telecoms operators and regulators. Small operators contend that their competitors' high off-net prices are anticompetitive. We show that if the utility of...

Inspired by the creation of the new Competition Authority in Portugal, we consider the interplay between regulatory agencies with overlapping competencies; for example, a competition authority and a sectoral regulator. We analyse how authorities’ incentives are affected if they can decide...

Competition authorities must pay attention to many industries simultaneously. Sectoral regulators concentrate on their own industry. Often both types of authority may intervene in specific industries and there is an overlap of jurisdictions. We show how a competition authority’s resource...

We analyse how sharing rules affect Nash equilibria in Bertrand games, where the sharing of profits at ties is a decisive assumption. Necessary conditions for either positive or zero equilibrium profits are derived. Zero profit equilibria are shown to exist under weak conditions if the sharing...

Universal service objectives are pervasive in telecommunications, and have gained new relevance after liberalization and the introduction of competition in many markets. Despite their policy relevance, little work has been done allowing for a thorough discussion of instruments designed to...

We consider competition in nonlinear tariffs when consumers mix two goods, and ask whether simple two-part tariffs or exclusivity can arise in equilibrium. Contrary to the existing literature, this happens only when consumer types are observable. If they are unobservable, then the equilibrium...