Bourreau, Marc, and Pinar Dogan. "Level of Access and Competition in Broadband Markets." Review of Network Economics 11.1 (March 2012): published online.
We consider an unregulated incumbent who owns a broadband infrastructure and decides on how much access to provide to a potential entrant. The level of access determines the amount of investment the entrant needs to undertake to enter the market, and the intensity of post-entry competition. We show that the equilibrium level of access is higher when the sensitivity of product differentiation to the level of access is lower, and when the investment cost is higher. We also show that the incumbent sets a suboptimally low (high) level of access if the degree of service differentiation is sufficiently high (low).