Using a large dataset covering all trade in military equipment over the period 1950-2007, we address the relationship between differences in polity and arms trade from a novel empirical perspective. We provide evidence on the determinants of link formation at the bilateral level by estimating...

We investigate the efficiency and stability of R&D networks in a model with network-dependent indirect spillovers. We show that the efficient network structure critically depends on the marginal cost of R&D collaborations. When the marginal cost is low, the complete graph is efficient, while...

We conduct an experiment in continuous time: every subject can change her links to others and her action in a Hawk–Dove game, which she plays bilaterally with each of her linked partners, at any time. We hypothesize that norms exist regarding who establishes and thus pays for links, and that...