Many OECD countries have changed the rules for immigrants in recent decades, generally making harder to enter and to stay. France is one example. This paper studies the immigrants' response to the 2004 reform of the immigration law, which made it harder for foreigners to obtain resident status....

In this paper, we argue that credit market imperfections impact not only the level of unemployment, but also its persistence. For this purpose, we first develop a theoretical model based on the equilibrium matching framework of Mortensen and Pissarides (1999) and Pissarides (2000) where we...

This article analyzes whether the large scale provision of non-contributory health services encourages workers to move away from jobs that pay contributions to social security (formal employment). Using a difference-in-differences design, that exploits the variation generated by the municipal...

The 'ratchet effect' refers to a situation where a principal uses private information that is revealed by an agent's early actions to the agent's later disadvantage, in a context where binding multi-period contracts are not enforceable. In a simple, context-rich environment, we experimentally...

We provide the first theoretical analysis of altruism in networks. Agents are embedded in a fixed, weighted network and care about their direct friends. Given some initial distribution of incomes, they may decide to support their poorer friends. We study the resulting non-cooperative transfer...

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...

Ce rapport de recherche est une synthèse de la littérature en sciences sociales abordant la question de la régulation formelle des communautés en ligne, en particulier celles des sites de réseaux sociaux, de partage de vidéos, de "fanfictions", les communautés open-source, open-media, les...

Despites the great interest caused by social networks in Business Science, their analysis is rarely performed both in a global and systematic way in this field: most authors focus on parts of the studied network, or on a few nodes considered individually. This could be explained by the fact that...

The purpose of this paper is to offer customer relationship insights in what is a fast developing new e-commerce development strategy. We examine the potential synergies between digital social networks (DSN) and e-commerce websites, thus bringing e-commerce and DSN websites into the same...

This case study is made from an action-research intervention in a very huge multinational company of telecommunications. The objectives of the projects were to change the miond (attitudes, behavior and competences) of all these people who work in software development in the company (several...