Weblogs or blogs have recently received a lot of attention, especially in the business community, with a number of firms encouraging their employees to publish blogs to reach out and connect to a wider audience. It is beginning to be recognized that employee blogs can cast a firm in either a...

Although we have many tools to understand the effect of regulation on competition, we know little about the importance of enforcement in explaining the impact of regulation. For this purpose, this paper uses data from Spanish local television industry in Spain from 1995 through 2001, which...

We examine the effects of mobile termination rate regulation in asymmetric oligopolies. We do this by extending existing models of asymmetric duopoly and symmetric oligopoly where consumer expectations about market shares are passive. We first calibrate product differentiation parameters using...

In Portugal, the telecommunications incumbent o®ers broadband access to the Inter- net, both through digital subscriber line and cable modem. In this article, we estimate the impact on broadband access to the Internet of the structural separation of these two businesses. We use a panel of...

We present experimental results from a series of sessions organized using the Power Market simulator; a software designed to realistically replicate the Spanish Electricity Market. In the experiments reported here we compare the status quo to two alternative treatments which represent...

We study oligopolistic firms' incentives to share customer information about past purchase history in a situation where firms are uncertain about whether a particular consumer considers the product offerings complements or substitutes. By addressing this new type of behavior-based price...

We study a retail benchmarking approach to determine access prices for interconnected networks. Instead of considering fixed access charges as in the existing literature, we study access pricing rules that determine the access price that network i pays to network j as a linear function of the...

We consider some two dynamic models of entry in mobile telephony, with and without strategic pricing, and taking into account market penetration at entry, locked-in consumers and tariff-mediated network externalities. We show that on/off-net differentials may reduce the possibility of entry if...

Inspired by the ongoing debate regarding the liberalization of the Spanish railway network, we use real-world information on the features of passenger transportation demand and the existing network infrastructure to build a complex experimental setting. We test the efficiency of alternative...

I generalize the workhorse model of network competition (Armstrong, 1998; Laffont, Rey and Tirole, 1998a,b) to include income effects in call demand. Income effects imply that call demand depends also on the subscription fee, not only on the call price. In the standard case of differentiated...