We study concentration in the European Internet upstream access market. The possibility of measuring market concentration depends on a correct definition of the market itself; however, this is not always possible, because very often in the Internet industry antitrust authorities lack reliable...

The model explains the emergence of asymmetric productive structures among regions based on adoption of a quality improving technology. Firms' products are differentiated both in location and quality, location is given. We characterize symmetric and asymmetric equilibria of the two stage game in...

We study the role played by geographical distance in the peering decisions between Internet Service Providers. Firstly, we assess whether or not the Internet industry shows clustering in peering; we then concentrate on the dynamics of the agglomeration process by studying the effects of...