We study network games with linear best-replies and strategic complementarities. We assume that actions are continuous but bounded from above. We show that there is always a unique equilibrium. We find that two key features of these games under small network effects may not hold when network...

We study network games under strategic complementarities. Agents are embedded in a fixed network. They choose a positive, continuous action and interact with their network neighbors. Interactions are positive and actions are bounded from above. We first derive new sufficient conditions for...

We consider agents playing a linear network game with strategic complementarities. We analyse the problem of a policy maker who can change the structure of the network in order to increase the aggregate efforts of the individuals and/or the sum of their utilities, given that the number of links...

In a vertically differentiated oligopoly, firms raise cost-reducing alliances before competing with each other. It is shown that heterogeneity in quality and in cost functions reduces individual incentives to form links. Furthermore, both differentiated Cournot and Bertrand competition...

We study the formation of a communication network under perfect foresight. We show the existence of a non-monotonic relationship between the cost of link formation and the total number of links created in stable networks. This result enhances a dilemma between stable and efficient networks....

We explore collective behaviors in a deterministic mode of interacting agents. We relate unanimity of diversity to the structura conditions of the interaction network.

This paper describes inter-firm partnerships in three major high-tech industries over the 1985-2005 period. We found that the architecture of the respective networks had evolved toward a 'small world' in the early 1990s. We also found that the number of alliances collapsed in the late 1990s....

[eng] While adopting an approach of innovation diffusion in terms of interacting agents, we emphasise the role of cumulated influence in the context of social networks. We first introduce a cumulative effect in the classical epidemic model which involves a slower starting phase followed by a...

[eng] The role of social networks in innovation diffusion remains a strategic question. In former works, we have introduced a relational learning, based on hebbian rule, that leads to a critical state, in which few agents reach structural positions of opinion leaders. In this paper, we show that...

[eng] A recent literature studies economic situations where agents have to form links with others for strategic goals. A major contribution in this field is the focus on dilemmas between stable networks - in the sense of strategie interests - and efficient networks - in the sense of maximization...