Europe is oscillating between increased integration and permanent risk of dissolution. In this framework, one often debates the role of bilateral relations, with the following question: does bilateralism foster or delay overall co-operation? We address this question in an experimental framework...

Nous étudions expérimentalement le comportement de sujets confrontés, dans une population, à une multiplicité de jeux du dilemme du prisonnier, suivant que les interactions sont bilatérales ou multilatérales. Nous observons, (i), une coopération significativement supérieure en cas de...

We study the effect of voluntary participation in the context of a collective-good experiment. We investigate whether the freedom to participate in the game or not increases contribution levels and enhances their evolution. The analysis of two voluntary participation treatments supports a...