Often, fi xed-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...

The present article discusses economic issues related to the design of optimal regulatory contracts on the example of the urban public transport industry. It highlights the importance of the design of efficient regulatory contracts in the context of changes facing the urban transportation...

This paper studies access pricing under three regimes: regulated access (VSR), negotiated access with discriminatory pricing (VSD) and negotiated access with non-discriminatory pricing (VSN). We compare each regime along three metrics: network quality, consumer surplus, and social welfare. To do...

This paper studies the effect of termination rates on substitution between fixed and mobile calls and access, in a model where heterogeneous consumers can subscribe to one or both types of offers. Simulations show that each (fixed or mobile) termination rate has a positive effect on the take-up...

This paper analyses the impact of substitution between fixed and mobile telephony on call prices. We develop a model where consumers differ in the benefits of mobility and firms price discriminate between on-net and off-net calls. We find that call prices are distorted downwards due to...

Economic regulation is portrayed as the objective application of clear economic theory to data in order to develop outcomes which overcome the problems associated with natural monopoly in a non-political, unbiased fashion. However, is the appearance of objectivity only skin-deep? This paper...

We describe a pair of subadditivity tests that can be used to evaluate the technological feasibility of separating a vertically integrated network monopoly into a common infrastructure component and competing operating components. We implement the tests with a Generalized McFadden cost function...