School for Advanced Studies in the Social Sciences

About: School for Advanced Studies in the Social Sciences is a facility organization based out in Villejuif, France. It is known for research contribution in the topics: Population & Politics. The organization has 1230 authors who have published 2084 publications receiving 57740 citations. The organization is also known as: Ecole des Hautes Etudes en Sciences Sociales & EHESS.

May's instability in large economies

Abstract: Will a large economy be stable? Building on Robert May's original argument for large ecosystems, we conjecture that evolutionary and behavioural forces conspire to drive the economy towards marginal stability. We study networks of firms in which inputs for production are not easily substitutable, as in several real-world supply chains. Relying on results from random matrix theory, we argue that such networks generically become dysfunctional when their size increases, when the heterogeneity between firms becomes too strong, or when substitutability of their production inputs is reduced. At marginal stability and for large heterogeneities, we find that the distribution of firm sizes develops a power-law tail, as observed empirically. Crises can be triggered by small idiosyncratic shocks, which lead to ``avalanches'' of defaults characterized by a power-law distribution of total output losses. This scenario would naturally explain the well-known ``small shocks, large business cycles'' puzzle, as anticipated long ago by Bak, Chen, Scheinkman, and Woodford.

Of ordinariness and citizenship processes

Abstract: This paper explores the relations between ordinariness and citizenship processes along two different lines. It first aims at empirically exploring certain uses of ordinariness as a political category. While it is often used as a depoliticisation tool, the two case studies analysed here underline on the contrary its politicising potential. In a second, briefer, part, it proposes a discussion of the gains to be obtained in citizenship studies, from using ordinariness as a category of analysis. Approaching citizenship processes ‘from the ordinary’ is a fruitful perspective from which the political dimensions of usually unseen or unheard practices and sites can be grasped. What connects the two discussions presented here is the complex and paradoxical relationship the two categories of ordinariness and politics entertain, both empirically and analytically.

A free subalgebra of the algebra of matroids

Abstract: This paper is an initial inquiry into the structure of the Hopf algebra of matroids with restriction-contraction coproduct. Using a family of matroids introduced by Crapo in 1965, we show that the subalgebra generated by a single point and a single loop in the dual of this Hopf algebra is free.