1,721,277 research outputs found
Présentation générale
No full textIvaldi Marc. Présentation générale. In: Économie & prévision, n°91, 1989-5. Etudes sectorielles. pp. 3-8
Présentation générale
No full textIvaldi Marc. Présentation générale. In: Économie & prévision, n°91, 1989-5. Etudes sectorielles. pp. 3-8
A test of the impact of mergers on bank competition
Full text linkWe propose a new test to evaluate the impact of horizontal mergers on competition in the banking industry. The test is designed to be applied ex ante to potential mergers while being parsimonious in terms of data, as it only uses
information on branches in local markets. The test is a counterfactual exercise based on a two-stage model where banks compete in branching and interest rates and requires comparing the estimated degree of competition in the status quo, where branching networks by banks are those actually observed, with a counterfactual scenario, where the branching network of the new entity is the sum of the branches of the banks involved in the horizontal merger. The statistical difference between the two estimated measures of competition quantifies the impact of the merger.We apply our test to French and Italian mergers
Econométrie de la concurrrence imparfaite sur les marchés à produits différenciés.
No full textStudying differentiated product markets has become one of the main topics in New Empirical Industrial Organization. This paper presents different methodological approaches that have been used. It stresses on their pros and cons according to the type of available data and the features of the market under study. The framework of a structural static equilibrium model is provided when dealing with micro-level data relative to demand side and market-level data relative to the supply side. An application to the Household Telephone Equipment Market in France is then proposed.L'étude des marchés produits différenciés est devenue un domaine impor tant de économie industrielle appliquée Cet article présente les diverses appro ches méthodologiques utilisées Il souligne les avantages et les inconvénients elles impliquent selon les données dont on dispose et les caractéristiques du marché que on étudie Une base de travail est proposée dans optique un trai tement structurel un modèle équilibre statique estimé partir de données indi viduelles relatives la demande et de données de marché relatives offre Une application est faite au marché des téléphones grand public en FranceFoncel Jérôme, Ivaldi Marc, Jessua Claude. Econométrie de la concurrrence imparfaite sur les marchés à produits différenciés. In: Revue économique, volume 47, n°3, 1996. pp. 477-486
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Analyse Coût-Bénéfice dans un contexte de concurrence intermodale et intramodale
No full textThis study presents a methodology to evaluate the impact of a new transportation infrastructure on social welfare, taking into account both inter-and intramodal competition. The new infrastructure alters the characteristics of the transportation mode involved, entailing changes in the competition framework. We apply our methodology to a specific example : the introduction of a rail link between two German cities. We simulate the resulting changes in market equilibrium, when consumers choose a transportation mode and an operator to travel on a given city-pair. At the same time, operators strategically set prices for the types of service they provide. This approach can be used to classify investment projects in an imperfect-competition setting.Cette étude propose une approche pour évaluer l’impact d’une infrastructure de transport sur le bien-être social en tenant compte explicitement de ses effets sur la concurrence intermodale et intramodale. La réalisation d’une infrastructure particulière change les caractéristiques du mode de transport associé et donc les conditions de la concurrence. À l’aide d'un exemple, nous simulons comment une nouvelle infrastructure ferroviaire sur une liaison spécifique modifie l’équilibre du marché dans lequel les consommateurs choisissent un mode de transport ainsi qu’un opérateur pour voyager entre deux villes particulières. Simultanément les opérateurs décident de manière stratégique des prix associés aux différents services qu’ils fournissent. De là, cette approche appliquée à différents projets d’investissements permet de les classer dans un environnement de concurrence imparfaite.Vibes Catherine, Ivaldi Marc. Analyse coût-bénéfice dans un contexte de concurrence intermodale et intramodale. In: Économie & prévision, n°178-179, 2007-2-3. pp. 41-49
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
- …
