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...

Connectivity, the characterising feature of the Internet, requires the definition of access prices, transit charges, among connected operators. However, for many information exchanges, the network hierarchies in the Internet are not fixed: two providers can be simultaneously supplier and...