In this paper we study concentration in the European Internet upstream access market. Measurement of market concentration depends on correctly defining the market, but this is not always possible as Antitrust authorities often lack reliable pricing and traffic data. We present an alternative...

Does asymmetry between Internet Providers affect the “fairness” of their interconnection contracts? While recent game theoretic literature provides contrasting answers to this question, there is a lack of empirical research. We introduce a novel dataset on micro-interconnection policies and...

The paper models the evolution of regional asymmetries, and the associated intra-distribution mobility, as the outcome of adoption decisions taken by firms at different locations. The following equilibria are characterised: Persistent asymmetry where nobody adopts, Leapfrogging where low-quality...

Economic agents' behavior is affected by their position in a network, either exogenous or endogenous, in which they interact with a subset of neighbours only. The network's links, which may be generated by vertical and/or horizontal relations, or by more complex morphologies, may explain the...

In questo lavoro l’analisi degli spillover si è concentrata sulle esternalità fra le impre-se italiane del tipo intra- e inter-industry ed i loro effetti sulla produttività. Le rela-zioni tra i vari settori sono state approssimate attraverso una matrice degli scambi commerciali. I...

We argue that it may be inappropriate to study whether high-tech firms are liquidity-constrained, without first modeling their antecedent decision to apply for credit. This sample selection issue is relevant when studying a borrower-lender relationship, as the same factors can influence both the...

This article treats the selectivity issue in the analysis of cooperative R&D and also presents some new results, e.g. that a firm's organization, vertical relationships and innovation strategy are important drivers of a decision to engage in R&D both independently and with external partners.