Archive ouverte de l'ESSEC Business School
Not a member yet
1344 research outputs found
Sort by
Le tournant “materiel” dans la theorie neoinstitutionnaliste.
No full textDans ce chapitre, nous rendons compte du ‘tournant matériel’ qui s’amorce actuellement au sein de l’analyse institutionnelle, comme dans de nombreux autres domaines de la recherche en organisation (Jarzabkowski et Pinch, 2013). Pour cela, nous nous appuyons sur les acquis des Science and Technology Studies (STS) qui inspirent la théorie des organisations de manière générale. Nous mettons en évidence quelques éléments structurants de la théorie néoinstitutionnaliste (TNI) et des STS, pour en souligner les différences et les écarts paradigmatiques. Nous notons ensuite l’irruption de la dimension matérielle au sein du néoinstitutionnalisme et rendons compte de quelques recherches récentes s’inscrivant dans cette perspective. Finalement, nous formulons quelques pistes de recherche prometteuses pour tirer le meilleur parti de la fertilisation croisée entre la TNI et les STS
An Efficient Mechanism for Competitive Markets with Adverse Selection
No full textI construct an efficient mechanism for competitive markets with adverse selection. In the mechanism, each company offers two menus of contracts: a public menu and a private menu. The union of all the public menus needs to be offered by every active company in the market. On the contrary, a private menu concerns only the company that offers it. I show that this simple mechanism reduces the set of profitable deviations to the extent that a pure-strategy equilibrium exists in every market with adverse selection. Furthermore, I characterise general, well-studied environments in which the set of equilibrium allocations coincides with the set of efficient allocations
Une lecture socio-technique des effets des systèmes d’encaissement automatique : quand la technologie reconfigure les relations sur le point de vente
No full textInternational audienceSelf-service technologies (self-checkout and self-scanning systems) have seen an accelerated expansion over the last decade. Through qualitative interviews with retailers’ clients, this paper adopts a relational perspective by revealing these new devices’ impact on clients’ identity as well as on their relationships at three levels: relationships with checkout assistants, with family members, and with other clients. At a societal level, these devices raise new questions about changing human relationships and labor division. Guidelines are proposed to managers in order to facilitate the integration of self-checkout devices in the point of sales environment.Les systèmes d’encaissement automatique (caisses libre-service dites self-check out et systèmes de self-scanning) connaissent un développement accéléré en France depuis une dizaine d’années. Au travers d’une étude qualitative menée auprès de clients de la grande distribution, cet article permet de mieux comprendre les effets de ces nouveaux dispositifs sur les relations entre les acteurs sur le point de vente. Loin de déshumaniser le point de vente, ils reconfigurent les relations du client avec son entourage, avec les autres clients, ainsi qu’avec les hôtesses de caisse. Plus largement, à l’échelle de la société, ils suscitent des questionnements sur la transformation des liens et le partage du travail. Des recommandations sont proposées aux managers pour faciliter l’intégration de ces dispositifs dans le point de vente
Persona-fied brands : managing branded persons through persona
No full textInternational audienceWe investigate how the concept of persona can be used in managing brand persona-fication. Based on interviews with informants working across the gastronomy sector, we examine the characteristics of the chef persona, and the role that chef persona plays in restaurant management. We differentiate persona-fied brands from other human brands, we dimensionalise the chef persona, and we identify two possible models of brand management through persona: (1) the distributed or fragmented persona-fication of the brand, which is based on a disjunction of different facets of the brand persona, each embodied in different persons; and (2) the unified persona-fication of the brand, which is based on the conjunction of the different facets of the brand persona. Here, the persona is embodied in a single person who embodies the different facets of the brand persona. Our analysis surfaces theoretical resonance with the performative turn in marketing scholarship.<br/
What languages can teach us about gender norms of behaviour
No full textBog of the CEPR.Evidence suggests that many forms of gender inequality are higher in countries where the language distinguishes gender. But these patterns could arise spuriously, as languages and other cultural institutions have co-evolved throughout history. This column uses an epidemiological approach to isolate language from other cultural forces and provide direct evidence on whether language matters. The findings suggest how gender roles have been shaped, how they are perpetuated, and, ultimately, how they can be changed.Blog article about Gay, Hicks, and Santacreu-Vasut (2016). "Language and Gender Roles among Immigrants to the U.S. A Historical Perspective." In P. Paolini (Ed.), I Mondi Delle Donne, 165-79. Roma: Edi Cusano.Available at: https://voxeu.org/article/languages-and-gender-norms-behaviour
The Multiple Facets of Partial Least Squares Methods
No full textInternational audienceThis volume presents state of the art theories, new developments, and important applications of Partial Least Square (PLS) methods. The text begins with the invited communications of current leaders in the field who cover the history of PLS, an overview of methodological issues, and recent advances in regression and multi-block approaches. The rest of the volume comprises selected, reviewed contributions from the 8th International Conference on Partial Least Squares and Related Methods held in Paris, France, on 26-28 May, 2014. They are organized in four coherent sections: 1) new developments in genomics and brain imaging, 2) new and alternative methods for multi-table and path analysis, 3) advances in partial least square regression (PLSR), and 4) partial least square path modeling (PLS-PM) breakthroughs and applications. PLS methods are very versatile methods that are now used in areas as diverse as engineering, life science, sociology, psychology, brain imaging, genomics, and business among both academics and practitioners. The selected chapters here highlight this diversity with applied examples as well as the most recent advances
The determinants of user innovation in medical imaging devices
No full textInternational audienceno abstrac
Risk neutral versus real-world distribution on puclicly listed bank corporations
No full textIn this study, we examine different quantitative methods to recover the risk neutral distribution function associated to the prices of option on bank shares. This is useful for a wide range of applications, such as determining the implicit State guarantee that systemic financial institutions benefit from the State, or looking if the market prices correctly the fat tails of financial returns. We assess the performance of these techniques in various ways, including comparing market option prices and historical Values-at-Risk to option prices and Value-at-Risk implied by the estimated risk neutral distribution. We find that, contrary to what is expected for a market composed of risk averse investors, the latter is much smaller than the one obtained from real data. We discuss our results with respect to the theory of risk neutral valuation and investor risk preference
Banking or Bankrupting: Strategies for Sustaining the Economic Future of Public Cord Blood Banks
No full textInternational audienceBackgroundCord blood is an important source of stem cells. However, nearly 90% of public cord blood banks have declared that they are struggling to maintain their financial sustainability and avoid bankruptcy. The objective of this study is to evaluate how characteristics of cord blood units influence their utilization, then use this information to model the economic viability and therapeutic value of different banking strategies.MethodsRetrospective analysis of cord blood data registered between January 1st, 2009 and December 31st, 2011 in Bone Marrow Donor Worldwide. Data were collected from four public banks in France, Germany and the USA. Samples were eligible for inclusion in the analysis if data on cord blood and maternal HLA typing and biological characteristics after processing were available (total nucleated and CD34+ cell counts). 9,396 banked cord blood units were analyzed, of which 5,815 were Caucasian in origin. A multivariate logistic regression model assessed the influence of three parameters on the CBU utilization rate: ethnic background, total nucleated and CD34+ cell counts. From this model, we elaborated a Utilization Score reflecting the probability of transplantation for each cord blood unit. We stratified three Utilization Score thresholds representing four different banking strategies, from the least selective (scenario A) to the most selective (scenario D). We measured the cost-effectiveness ratio for each strategy by comparing performance in terms of number of transplanted cord blood units and level of financial deficit.ResultsWhen comparing inputs and outputs over three years, Scenario A represented the most extreme case as it delivered the highest therapeutic value for patients (284 CBUs transplanted) along with the highest financial deficit (USD 5.89 million). We found that scenario C resulted in 219 CBUs transplanted with a limited deficit (USD 0.98 million) that charities and public health could realistically finance over the long term. We also found that using a pre-freezing level of 18 x 108 TNC would be the most cost-effective strategy for a public bank.ConclusionOur study shows that a swift transition from strategy A to C can play a vital role in preventing public cord blood banks worldwide from collapsing
A branch-and-price-and-cut approach for sustainable crop rotation planning
No full textInternational audienceIn this paper, we study a multi-periodic production planning problem in agriculture. This problem belongs to the class of crop rotation planning problems, which have received considerable attention in the literature in recent years. Crop cultivation and fallow periods must be scheduled on land plots over a given time horizon so as to minimize the total surface area of land used, while satisfying crop demands every period. This problem is proven strongly NP-hard. We propose a 0-1 linear programming formulation based on crop-sequence graphs. An extended formulation is then provided with a polynomial-time pricing problem, and a Branch-and-Price-and-Cut (BPC) algorithm is presented with adapted branching rules and cutting planes. The numerical experiments on instances varying the number of crops, periods and plots show the effectiveness of the BPC for the extended formulation compared to solving the compact formulation, even though these two formulations have the same linear relaxation bound