Depuis quelques années, les réseaux sociaux et les usages qu'ils nourrissent ont pris une place significative au sein de la galaxie Internet. Parmi ces réseaux, ceux qui pratiquent la gratuité pour les utilisateurs finals n'ont pas encore stabilisé leur modèle économique et ce, malgré...

This paper studies optimal pricing in networks in the presence of local consumption or price externalities. It analyzes the relation between prices and nodal centrality measures. Using an asymptotic approach, it shows that the ranking of optimal prices and strategies can be reduced to the...

L'article étudie les déterminants de la production scientifique des enseignant-chercheurs français en économie en mobilisant des données originales issues des candidatures aux campagnes nationales 2009 et 2010 de la " Prime d'Excellence Scientifique ". L'échantillon constitué à partir de...

Big airports profits are more and more often coming from commercial activities such as retailing. However, commercial services are relatively far from the original mission of the airport : providing airlines with aviation services such as ground handling, terminal management or airside...

We characterize the equilibrium of a game in vertically differentiated market which exhibits network externalities. There are two firms, an incumbent and a potential entrant. Compatibility means in our model that the inherent qualities of the goods are close enough. By choosing its quality, the...

Empirically the diffusion of competing technologies most often displays either "lock-in" to a quasi-monopoly or apparent turbulence but rarely stable market-sharing. In contrast with widespread views, we show that, first, unbounded increasing returns are neither necessary nor sufficient to lead...

This article aims to study youth employability on the job access channel that provided their entry into the labor market. We examine the determinants of the formal and informal job access channels. For this purpose, we estimate a Multinomial Logit model of access channels controlling for...

This article considers the effects of uncertainty, structure, trust and resistance to change on the success or failure of management accounting innovations diffusion. The diffusion process is examined through a social network of nodes and ties. Ties represent communication channels through which...

Using village data from Tanzania, we test whether gifts and loans between households are voluntary while correcting for mis-reporting by the giving and receiving households. Two maintained assumptions underlie our analysis: answers to a question on who people would turn to for help are good...

Students' social networks are deeply disrupted during school transitions and students start in a classroom environment where almost all their peers are new. In this study, we investigate the consequences of keeping partly the same classmates during the transition to high school. To overcome the...