We study the investment of a telecommunications incumbent in quality and in cost reduction when an entrant can use its network through unbundling of the local loop. We ?nd that unbundling may lower incentives for quality improvements, but raises incentives for cost reduction. Therefore, it is...

We study the impact of access regulation in a telecommunications market on an entrant's decision whether to invest in a network or ask for access when the regulator cannot observe its potential demand. Since the entrant has incentives to not compete vigorously right after entry in order to...

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