[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...