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séminaires hebdomadaires

Les séminaires du CREM à Caen ont lieu habituellement salle SH027
Place de l’Esplanade, à Caen
le lundi à partir de 14h15



Voir le calendrier des prochains séminaires : GIF

Consulter les archives des séminaires : GIF


  • lundi 13 février 2017 - 14h15 à 15h45 - salle SH027
Intervenant Hayrullah Dindar -  Ph.D., Economics, İstanbul Bilgi University, İstanbul, Turkey
Invité par / Invited by Vincent Merlin
Titre / title Manipulation of indirect elections by vote swapping
Thème / Thema Choix social
Abstract We investigate a specific type of group manipulation in two-tiers elections, where groups of voters manipulate by exchanging votes. Two-tiers elections are modeled as a two-stage choice procedure where in the first stage voters are distributed into districts, each being assigned one delegate. Delegates’ preferences result from aggregating voters’ preferences district-wise by means of some aggregation rule. Final outcomes are subsets of alternatives obtained at the second stage by applying some social choice function to delegate profiles. Combining an aggregation rule and a social choice function defines a constitution.
Voters’ preferences are linear orders over alternatives, which are extended to partial orders over sets by means of either the Kelly or the Fishburn extension rule. A constitution is Kelly (resp., Fishburn) swapping-proof if no group of voters can get by exchanging their preferences a jointly preferred outcome according to the Kelly (resp. Fishburn) extension. We establish sufficient conditions for swapping-proofness. Special attention is paid to Condorcet (resp., positional) constitutions, where both the aggregation rule and the social choice function are based on simple majority voting (resp., a score vector). We characterize Kelly and Fishburn swapping-proof Condorcet constitutions, and show that no positional constitution is Kelly or Fishburn swapping proof.
Finally ; if the constitution is single-valued, we show that robustness to manipulation via vote-swapping together with other desirable properties leads to dictatoriality.
Mots clés / Keywords Representative Democracy -Vote Swapping -Vote exchange - Group Manipulation - Dictatoriality
JEL Code D71, C70


  • lundi 6 février 2017 - 14h15 à 15h45 - salle SH027
Intervenant Bertrand Tchantcho - Ecole Normale Supérieure de Yaoundé
Invité par / Invited by Sébastien Courtin
Titre / title Power theories for multi-choice organizations and political rules : Rank-order equivalence
Thème / Thema Choix social
Abstract Voting power theories measure the ability of voters to influence the outcome of an election under a given voting rule. In general, each theory gives a different evaluation of power, raising the question of their appropriateness, and calling for the need to identify classes of rules for which different theories agree. We study the ordinal equivalence of the generalizations of the classical power concepts – the influence relation, the Banzhaf power index, and the Shapley–Shubik power index – to multi-choice organizations and political rules. Under such rules, each voter chooses a level of support for a social goal from a finite list of options, and these individual choices are aggregated to determine the collective level of support for this goal. We show that the power theories analyzed do not always yield the same power relationships among voters. Thanks to necessary and/or sufficient conditions, we identify a large class of rules for which ordinal equivalence obtains. Furthermore, we prove that ordinal equivalence obtains for all linear rules allowing a fixed number of individual approval levels if and only if that number does not exceed three. Our findings generalize all the previous results on the ordinal equivalence of the classical power theories, and show that the condition of linearity found to be necessary and sufficient for ordinal equivalence to obtain when voters have at most three options to choose from is no longer sufficient when they can choose from a list of four or more options.


  • lundi 30 janvier 2017 - 14h15 à 15h45 - salle SH027
Intervenant Michael Wyrwich - Friedrich-Schiller-Universität, Jena
Invité par / Invited by Jean Bonnet
Titre / title TV and Entrepreneurship
Thème / Thema Entrepreunariat
Co-auteur/Joint work with Viktor Slavtchev
Résumé / abstract In this paper, we are interested whether TV can—while transmitting certain values, preferences, view of life and images—influence the decision of individuals to become an entrepreneur. We assess the causal effect of TV on entrepreneurship by means of econometric techniques in a quasi-natural ex- periment setting from Germany that (i) provides us with an exogenous variation in the access to TV (i.e. treatment) and (ii) helps avoid a potential bias from a non-random selection into treatment. In particular, we capitalize on the fact that a regionally-defined portion of the population of the former socialistic German Democratic Republic (East Germany or GDR) had an exogenous access to West German TV and was, thereby, exposed to a value and preferences system and to views of life that were characteristic for capitalistic societies and that put larger emphasize on individual characteris- tics typically found in entrepreneurs. The results of the econometric analysis indicate that the entre- preneurship propensity in East German areas that have had access to West German TV prior the Re- unification is in the period 1993-2007 on average ca. 10% higher (depending on specification) than the average entrepreneurship propensity in other East German areas that had no access to West German TV prior to Reunification. Moreover, we find that the differences between East German are- as with and such without access to West German TV prior to Reunification do not fade-out with time. Overall, these findings suggest that TV can shape preferences, values and view of life of individuals.
Mots clés / Keywords Entrepreneurship ; TV ; Values ; Transition ; Quasi-natural experiment


  • lundi 23 janvier 2017 - 14h15 à 15h45 - salle des thèses SH028
Intervenant Marcus Dejardin - University of Namur - Université catholique de Louvain
Invité par / Invited by Jean Bonnet
Thème / Thema Entrepreunariat
Titre / title Fitting a firm’s strategic position and environmental context with its managers’ personality traits. A configurational study of SME performance.
Co-auteur/Joint work with Dendi Ramdani, Arjen van Witteloostuijn, Johanna Vanderstraeten and Julie Hermans
Résumé / abstract Building upon the person–environment contingency model in combination with its strategy–environment counterpart, we adopt an integrated manager–strategy–environment configurational lens, and explore this perspective empirically by applying fuzzy set Qualitative Comparative Analysis to data from a sample of Belgian SMEs. We theorize that enterprises implementing a cost leadership strategy in a stable environment require top managers with high consciousness to generate high firm performance. In contrast, a firm conducting a product differentiation strategy in a dynamic environment needs a top manager with high openness to experience. Our evidence partly supports the theory, showing that openness to experience is an important personality trait not only for firms implementing product differentiation strategies in dynamic environments, but also for those with cost leadership strategies in stable environments. Furthermore, our evidence reveals that conscientiousness is an important personality trait for top managers running enterprises operating in stable environments implementing whatever strategy.


  • lundi 16 janvier 2017 - 14h15 à 15h45 - salle SH027
Intervenant Kevin Fourrey - Doctorant CREM, Unicaen, UFR SEGGAT
Titre / title Quality of government, decentralization and sub-national growth
Direction Isabelle Lebon - Frédéric Chantreuil
Co-auteur/Joint work with Luiz R. de Melloy and Joaquim de Oliviera Martins
Résumé / abstract In OECD countries 72% of public investment is in average managed by the sub-national governments (OECD, 2014). One might think that local governance quality influences returns of public investments, thus it seems appropriate to evaluate the impact of good governance on growth at a subnational level. This article looks at the hypothetical causal impact of good governance on the sub-national GDP growth per capita. Moreover, the study takes into consideration decentralization issues, especially because we might expect that quality of regional government impact on growth depends of sub-national power and competencies. To answer this question we use a multi-level model, with fixed effects and mixed effects depending on the question we treat. Hence, we look at the influence of quality of governance, decentralization and regional authority on regional growth, defined as the log annual growth average of GDP per capita from 2010 to 2013, within 18 European countries. This article gives evidence of a positive impact of quality of governance on regional growth, convex rather than linear, and increasing with tax decentralization and regional authority. Besides, there are some evidence that regional authority has a negative impact on growth, and that the tax decentralization effect depends on how it is measured. Anyway, the regional authority and tax decentralization effects tend to counterbalance each other, in the sense that the negative impact of regional authority decreases, and it may be positive, as tax decentralization indexes increase.
Lien/Download 17-11-16_Kevin Fourrey.pdf  : article indisponible en téléchargement


  • lundi 9 janvier 2017 - 14h15 à 15h45 - salle SH027
Intervenant Vincent Merlin - CREM, Unicaen, UFR SEGGAT
Thème / Thema Choix social
Titre / title Properties of Majoritarian Compromise,Efficient Compromise, and Related Compromise Rules
Co-auteur/Joint work with Ipek Ozkal SanverIpek Ozkal Sanver (Istanbul Bilgi University) and M. Remzi Sanver (CNRS, LAMSADE)
Résumé / abstract There is a recently growing interest in social choice rules using the trade-off between the quality and quantity of support behind alternatives. Without being exhaustive we can quote Sertel’s Majoritarian Compromise (MC), Brams and Kilgour’s q-Approval Fallback Bargaining (q-AFB), Ozkal-Sanver and Sanver’s Efficient Compromise (EC), Nurmi’s Condorcet Practical Method (CPM) and Bassett and Persky’s Median Voting Rule (MVR). Our point is that all these concepts which seem a priori different share a common feature which enable us to gather them in the same class, the class of compromise rules. They are all based upon elementary scoring rules which have been described extensively by Saari in a series of masterpiece papers on the properties of scoring rules. As a result, one can exploit these results to analyze the compromise rules with relative ease, which is the main point of our paper.


  • mardi 5 décembre 2017 - 16h - salle SH027
Intervenant Issofa Moyouwou - Université de Yaoudé
Invité par / Invited by Boniface Mbih
Thème / Thema Choix social
Titre / title Avoiding Anscombe’s Paradox : A domain Restricted Approach
Co-auteur/Joint work with N.G. Andjiga, K.M. Ouambo Kamdem
Résumé / abstract How to preclude all occurences of a given paradox ? We adopt the domain restriction approach to address Anscombe’s paradox. This paradox refers to the possibility that « a majority of the citizens agrees with every decision (from a list of mutually independent issues), and simultaneously, a majority of the citizens complains that most decisions are made against its will ». Our domain proposes a way of capturing a minimum consensus among individual opinions that discards all occurrences of Anscome paradox.
Lien/Download 16-12-05_Issofa Moyouwou.pdf


  • lundi 5 décembre 2016 - 14h15 à 15h45 - salle SH027
Intervenant Herrade Igersheim - BETA, Université de Strasbourg
Invité par / Invited by Béatrice Cherrier
Thème / Thema Histoire de la pensée économique
Titre / title The death of welfare economics : history of a controversy
Lien/Download 16-12-05_Herrade Igersheim.pdf


  • lundi 28 novembre 2016 - 14h15 à 15h45 - salle SH027
Intervenant Loic Ravenel - International Center for Sport Studies, Neuchâtel
Invité par / Invited by Frédérique Chantreuil
Thème / Thema Economie géographique
Titre / title Probabilités et valeurs de transfert : l’approche de l’Observatoire du football CIES
Co-auteur/Joint work with Raffaele Poli, Roger Besson
Lien/Download 16-11-28_Loic Ravenel.pdf


  • lundi 21 novembre 2016 - 14h15 à 15h45 - salle SH027
Intervenant Marc Laudet, docteur en économie et enseignant en sciences humaines à Caen
Invité par / Invited by Muriel Gilardone
Thème / Thema Histoire de la pensée économique : Aux Origines de l’Économie Politique
Titre / title Antoine de Montchrétien et son "Traîcté de l’OEconomie Politique”


  • lundi 14 novembre 2016 - 14h15 à 15h45 - salle SH027
Intervenant Emanuelle Auriol - TSE, Université Toulouse 1 Capitole
Invité par / Invited by Sara Biancini
Thème / Thema Development Economics
Titre / title Religious Co-option in Autocracy : A Theory Inspired by History
Co-auteur/Joint work with Jean-Philippe Platteau (Université de Namur)
Résumé / abstract The relationship between religion and politics is explored from a theoretical standpoint, assuming that religious clerics can be coopted by the ruler acting as an autocrat. The comparative effects of decentralized versus centralized religions on the optimal level of cooperation between the autocrat and the religious clerics, which itself impinges upon political stability, is analyzed. The paper shows that the presence of a decentralized body of clerics makes autocratic regimes more unstable. It also shows that in time of stability, the level of reforms is larger with a centralized religion than with a decentralized one. When the autocrat in the decentralized case pushes more reforms than in the centralized one, he always does so at the cost of stability. Historical case studies are presented that serve to illustrate the main results.


  • lundi 7 novembre 2016 - 14h15 à 15h45 - Amphi MRSH
Intervenant Gorkem Celik - THEMA, Université de Cergy Pontoise
Invité par / Invited by Daniel Danau
Thème / Thema Théorie des jeux
Titre / title Resale in Second-Price Auctions with Costly Participation
Co-auteur/Joint work with Okan Yilankaya (Nazarbayev University, Kazakhstan)
Résumé / abstract We study sealed-bid second-price auctions with costly participation and resale. Each bidder chooses to participate in the auction if her valuation is higher than her optimally chosen participation cutoff. If resale is not allowed and the bidder valuations are drawn from a strictly convex distribution function, the symmetric equilibrium (where all bidders use the same cutoff) is less e¢cient than a class of two-cutoff asymmetric equilibria. Existence of these equilibria without resale is sufficient for existence of similarly constructed two-cutoff equilibria with resale. Moreover, the equilibria with resale are .more asymmetric.and (under a sufficient condition) more efficient than the corresponding equilibria without resale.


  • lundi 17 octobre 2016 - 14h15 à 15h45 - salle SH027
Intervenant André de Palma - ENS Cachan
Invité par / Invited by Daniel Danau
Thème / Thema Economie des transports
Titre / title Tolls Versus Mobility Permits : A comparative Analysis
Co-auteur/Joint work with Stef Proost (KU Leuven), Ravi Seshadri (Singapore-MIT Alliance for Research and Technology), Moshe Ben-Akiva (Massachusetts Institute of Technology)
Résumé / abstract To address traffic congestion, two categories of instruments are used : price regulation (for instance, road pricing or congestion tolling) and quantity regulation (credit-based mobility schemes). Although the comparison of price and quantity regulation has received significant attention in the economics community, the literature is relatively sparse in the context of transportation systems. This paper develops a methodology to compare the toll and mobility permit instruments using a simple transportation network consisting of parallel highway routes and a public transport alternative. The permits can be traded across roads. The demand for each route is determined by a mixed logit route choice model and the supply consists of static congestion. The comparison is based on the optimum social welfare which is computed for each instrument by solving a non-convex optimization problem involving the mixed logit equilibrium constraints. Equity considerations are also examined. Numerical experiments conducted across a wide range of demand/supply inputs indicate that the toll and mobility permit instruments perform very closely in efficiency terms. The permit system is on average more efficient, but only by a small margin
Lien/Download 16-10-17_André de Palma.pdf


  • lundi 10 octobre 2016 - 14h15 à 15h45- salle SH027
Intervenant Thomas Tregouet - Université de Cergy Pontoise
Invité par / Invited by Clémence Christin
Thème / Thema Economie Industrielle
Titre / title On the Pro-Competitive Effects of Vertical Mergers in Two-Sided Markets
Co-auteur/Joint work with Jérôme Pouyet (Paris School of Economics)
Résumé / abstract We develop a framework to analyze the competitive impact of a vertical merger between a platform (e.g., operating system) and a downstream manufacturer (e.g., smartphone producers)in presence of two-sided network effects. Two platforms compete to supply two downstream manufacturers which sell to final customers. Consumers care not only about the manufacturers’ prices but also on sellers (e.g., application developers) joining the platform. Two-sided network effects make downstream manufacturers’ prices strategic substitutes. A vertical merger leads to a decrease of the price of the integrated manufacturer but to an increase of the non-integrated one’s. These effects have in turn an impact on the participation of sellers and thus on consumers’ utility. We show that a vertical merger is not privately profitable when network effects are strong ; the merger has a positive impact of the non-integrated manufacturer’s profit ; the merger increases total consumers’ surplus if the royalty only increases moderately. We discuss the implication of our results for competition authorities and extend our results in several dimensions.


  • lundi 3 octobre 2016 - 14h15 à 15h45 - salle SH027
Intervenant François Durand - Université de Caen Normandie
Invité par / Invited by Vincent Merlin
Thème / Thema Choix social
Titre / title Toward less manipulable voting systems
Résumé / abstract In 1973, Allan Gibbard proved that any non-dictatorial voting system with 3 eligible candidates or more is « manipulable », i.e. sensible to tactical voting. In some situations, some voters, by misrepresenting their preferences, may secure an outcome that they prefer to the result of sincere voting. However, depending on the voting system, such situations can be more or less frequent. We investigate how to design voting systems that reduce the frequency of manipulable situations.
Lien/Download Toward less manipulable voting


  • lundi 26 septembre 2016 - 14h15 à 17h
14h15 à 17h Assemblée générale - Site de Caen


  • lundi 19 septembre 2016 - 14h à 17h, salle MRSH 126 - Réunion de rentrée des doctorants et séminaire des doctorants
14h00 -15h00 Réunion de rentrée des doctorants
15h00 -16h00 Ferdaous Roussafi - CREM, Unicaen, UFR SEGGAT
Titre Facteurs de développement et de localisation des énergies renouvelables en France : Analyse Factorielle Multiple de données mixtes
Direction Patricia Maissant
Abstract Nous nous interrogeons sur les facteurs de développement et de localisation des énergies renouvelables au niveau des régions françaises. L’objectif est de rechercher les dimensions pertinentes pouvant expliquer la dynamique de la consommation régionale des ENR de 1990 à 2009 tout en évitant la colinéarité et la redondance de l’information. Nous appliquons l’Analyse Factorielle Multiple (AFM) de données mixtes (B. Escofier & J. Pagès (1988 - 1997) dans le but d’étudier les ressemblances entre les régions du point de vue de l’ensemble des variables. Nous avons ainsi construit un tableau récapitulatif de l’évolution des régions dans le temps. Les résultats montrent que certaines régions sont restées dans le même cluster tout au long de la période d’analyse, c’est le cas des deux régions, le Limousin et la Corse. C’est le cas également de l’Auvergne, La Bourgogne, Midi-Pyrénées, la Bretagne et Poitou-Charentes. La région Île-de-France constitue quant à elle un groupe à part durant toutes les années de l’étude.
16h00 -17h00 Ahmed Haddouche - CREM, Unicaen, UFR SEGGAT
Titre Mobilité des capitaux, chômage et efficacité des politiques publiques
Direction Abderrahmane Ziad et Frédéric Gavrel


  • lundi 12 septembre 2016 - 14h15 à 15h45, salle des Actes MRSH - Séminaire des doctorants
14h15 -15h00 Raouia Belayadi - CREM, Unicaen, UFR SEGGAT
Titre La symétrie Inverse : Pluralité et Anti-pluralité
Direction Boniface Mbih
Abstract L’approche axiomatique de la théorie du choix social permet d’examiner le comportement d’une procédure de choix social vis-à-vis d’un jugement de valeur émis par l’économiste. La propriété de symétrie inverse (reversal symmetry) est la propriété examinée dans notre présentation. Elle est violée par une procédure lorsque l’on peut trouver au moins une configuration de préférences pour laquelle l’inversion de toutes les préférences individuelles conduit au même résultat (même vainqueur - dans l’exposé - ou même relation de préférence collective - ailleurs dans la thèse) qu’avec le profil initial. Selon Saari (1999), toutes les règles positionnelles violent la propriété de symétrie inverse, à l’exception de la règle de Borda. L’un de nos objectifs dans la thèse est d’évaluer la vulnérabilité d’un certain nombre de règles de vote à la violation de cette propriété, en termes de fréquence de profils où la symétrie inverse n’est pas respectée. Nous effectuons ces calculs à la fois en domaine universel (c’est-à-dire lorsque les individus peuvent exprimer n’importe quel ordre de préférence), et en domaine restreint.
15h -15h45 Malia Kedjar - CREM, Unicaen, UFR SEGGAT
Titre Politique environnementale et éco-innovation : Concepts, indicateurs de mesure et éléments empiriques
Direction Patricia Maissant
Abstract "Face à l’enjeu et à la complexité de la préservation de l’environnement, de nombreuses études se sont intéressées à la politique environnementale et à son rôle dans la stimulation de l’éco-innovation. Dans ce chapitre, nous proposons une revue de la littérature à la fois théorique et empirique.
Notre revue de la littérature montre que l’éco-innovation est un concept qui est apparu récemment, et encore en évolution. Toutefois, tous les auteurs s’accordent sur le fait que la principale caractéristique qui la distingue des autres types d’innovation est sa contribution à la réduction de l’impact environnemental. Le développement de l’éco-innovation est entravé par des défaillances de marché ; elle est notamment confrontée à un problème de double externalité. Les études empiriques diffèrent sensiblement sur la démarche et la méthode d’analyse utilisées ainsi que sur le concept de l’éco-innovation. De même, les résultats de ces études divergent et sont validés pour des cas spécifiques. La question de l’incidence d’une réglementation environnementale sur la compétitivité reste encore indéterminée."
Abstract 16-09-09_Kedjar_Politique environnementale et éco-innovation.pdf




  • lundi 27 février 2017 - 14h15 à 15h45 - salle SH027
Intervenant AG du CREM à Caen


  • lundi 6 mars 2017 - 14h15 à 15h45 - salle SH027
Intervenant Arthur Charpentier - CREM, Université de Rennes 1
Titre / title TBA

Thème / Thema Assurance


  • lundi 13 mars 2017 - 14h15 à 15h45 - salle SH027
Intervenant Michel Grabisch =grabisch ] - CES, Université Paris 1 Panthéon Sorbonne
Invité par / Invited by Sébastien Courtin
Titre / title TBA

Thème / Thema Choix social


  • lundi 13 mars 2017 - 14h15 à 15h45 - salle SH027
Intervenant Kevin D. Hoover - D.Phil Oxford University
Invité par / Invited by Sébastien Courtin
Titre / title TBA

Thème / Thema Choix social


  • lundi 27 mars 2017 - 14h15 à 15h45 - salle SH027
Intervenant Julien Malizard - GREThA, Chaire Économie de défense
Invité par / Invited by Jean-Pascal Guironnet
Titre / title French arms exports and violent civil conflicts : An empirical investigation


  • lundi 3 avril 2017 - 14h15 à 15h45 - salle SH027
Intervenant Inés Macho-Stadler - Universitat Autònoma de Barcelona
Invité par / Invited by Daniel Danau
Titre / title TBA


  • mardi 4 avril 2017 - 14h15 à 15h45 - salle SH027
Intervenant David Pérez-Castrillo - Universitat Autònoma de Barcelona
Invité par / Invited by Daniel Danau
Titre / title TBA


  • lundi 24 avril 2017 - 14h15 à 15h45 - salle SH027
Intervenant Jean-François Maystadt - Lancaster University
Invité par / Invited by Olivier Dagnélie
Titre / title TBA


  • lundi 19 juin 2017 - 14h15 à 15h45 - salle SH027
Intervenant Rachida Justo - Universidad Autónoma de Madrid, Spain
Invité par / Invited by Nabil Khelil
Titre / title TBA


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