Calendrier du 02 décembre 2019
Roy Seminar (ADRES)
Du 02/12/2019 de 17:00 à 18:30
salle R2-21, campus Jourdan - 75014 Paris
PYCIA Marek (University Zurich)
Evaluating with Statistics: Which Outcome Measures Differentiate Among Matching Mechanisms?
The selection of mechanisms to allocate school seats in public school districts can be highly contentious. At the same time the standard statistics of student outcomes calculated from districts’ data are very similar for many mechanisms. This paper contributes to the debate on mechanism selection by explaining the similarity puzzle as being driven by the invariance properties of the standard outcome statistics: outcome measures are approximately similar if and only if they are approximately anonymous.
Texte intégral
Régulation et Environnement
Du 02/12/2019 de 12:00 à 13:00
salle R1-13, campus Jourdan - 75014 Paris
SABATINO Lorien (Politecnico di Torino)
Fast Internet and Firm Creation: Evidence from Italy
In this paper we provide new empirical evidence on the impact of ultra-fast broadband deployment on local growth, and in particular on local new business establishment. We leverage on a unique dataset collecting data on broadband coverage and firm creation for every Italian municipality over the period 2013-2018. Our identification strategy relies on the distance between municipalities and the closest telephone exchange with optical line terminal (OLT). Preliminary results show that OLS estimates are upward biased, as they overestimate the impact of ultra-fast broadband deployment on firm establishment.
Results depend crucially on the industrial sector we
consider: technology-intensive sectors such as ICT and scientific activities are strongly positively affected by the introduction of new broadband infrastructure, while more traditional sectors such as agriculture and manufacturing are not significantly affected by high-speed connections. Taken together, our results highlight the heterogeneous effects of new broadband technologies on local business establishment.
Paris Game Theory Seminar
Du 02/12/2019 de 11:00 à 12:00
Institut Henri Poincaré, 11 rue Pierre et Marie Curie, Paris 5ème
GALICHON Alfred (New York University)
The equilibrium flow problem and multivocal gross substitutes
écrit avec Larry Samuelson and Lucas Vernet
We show that several classical economic models such as two-sided matching models, min-cost flow problems, hedonic models, and dynamic programming problems are subcases of a more general class of problems called equilibrium flow problems. To analyze this problem, we introduce a novel notion of gross substitutes for correspondences called "multivocal gross substitutes". We show that this notion generalizes some familiar notions of substitutes (such as weak gross substitutes) while strengthening others (such as that of Kelso and Crawford). Our main result, the inverse isotonicity theorem, establishes that if an excess supply correspondence satisfies multivocal gross substitutes, then the inverse correspondence is isotone in the strong set order, extending to the corresponding case results by Berry, Gandhi and Haile (2013). As another consequence, extend the lattice structure results of Demange and Gale (1985) to general networks beyond the bipartite case.