We establish necessary conditions of optimality for problems of optimal control Theory in the discrete time framework with infinite horizon. Our necessary conditions are in the form of Pontryagin principles. We treat smooth and partially nonsmooth settings, without concavity. A strong motivation...

We study the relationship between social segmentation and income inequality by means of the economic theory of clubs with private provision of the club good. After having characterized the equilibrium partition of society in clubs and investigating its characteristics, we show how the clubs'...

This paper (forthcoming in The Columbia Anthology of 20th Century French Thought), aims at presenting some important steps in the development of twentieth century French economic thought. More precisely, I suggest the way some nowadays neglected pieces of work can pave the way to fruitful...