Most of the empirical and theoretical literature aimed at understanding the behavioral patterns that lead to the formation of social networks argue that such networks are clustered because agents like social closure, since it facilitates cooperation enforcement, for instance, or increases match...

The modelling of networks formation has recently became the object of an increasing interest in economics. One of the important issues raised in this literature is the one of networks efficiency. Nevertheless, for non trivial payoff functions, searching for efficient network structures turns out...