Recherche académique à emlyon business school
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Umigon-lexicon: rule-based model for interpretable sentiment analysis and factuality categorization
No full textInternational audienceWe present umigon-lexicon, a set of lexicons in English and associated conditions to evaluate sentiment in a text. These lexicons are curated to capture the subjective sentiment conveyed by the author specifically, as opposed to the identification of the overall sentiment. We provide a comparison with existing lexicons before evaluating the performance on sentiment and factuality classification tasks. These contributions highlight the long-lasting relevance of lexicon-based solutions for algorithmic, inherently interpretable models in sentiment analysis and factuality categorization
Firm Formalization Strategy : The Interaction of Entrepreneurs and Government Officials in the Enforcement of Regulation
No full textInternational audienceThis research investigates how entrepreneurs in an early-stage market economy decide their level of compliance with formal rules and finds the manner in which they interact with government officials to operate on a continuum of formality. Focusing on the nonmarket strategy approaches entrepreneurs employ to establish relationships with government officials, we build a model that shows how entrepreneurs adopt strategies aligned with their firm’s level of formality, spanning low to high formality practices. We draw on qualitative interview data from entrepreneurs who exhibit varying levels of compliance with state-provided rules and guidelines. We inductively theorize that deciding the firms’ level of formality involves strategic interaction approaches with government officials responsible for rule enforcement. Our findings highlight that the interaction strategies entrepreneurs use hinge on the political capital they possess, eliciting the desired response from government officials, and dissuading the officials from enforcing formal rules or imposing sanctions for informality. We offer theoretical and policy implications for future work on the nuances of firm formality and the interaction between entrepreneurs and government officials.<br /
DE L’OPERATIONNEL AU FACILITATEUR HUMAIN : LE MANAGER DE PROXIMITE, UN CATALYSEUR DE BIENVEILLANCE DANS UN ENVIRONNEMENT EN MUTATION
No full textInternational audienceLa prise de conscience croissante de la crise environnementale a conduit plus récemment à l'intégration d'injonctions écologiques dans les normes nutritionnelles et les politiques alimentaires. La restauration scolaire, service public facultatif, est aujourd'hui au cœur d'enjeux éducatifs, sociaux, environnementaux et sanitaires (CNA, 2017). Depuis plusieurs années, elle fait l'objet d'un renforcement des normes et de pressions par des lois, EGALIM et AGEC, et cela à plusieurs niveaux (accès, équilibre nutritionnel, qualité et produits durables, diversification des protéines, gaspillage alimentaire, interdiction du plastique, tarification, règles sanitaires, etc.). Il s'agit de lois dont les dates d'application progressives s'échelonnent de 2018 à 2025. Ce sont des lois contraignantes qui fixent et imposent des contraintes que les entreprises doivent respecter sous peine de sanctions. Toutes ces pressions et les responsabilités liées à l’hygiène alimentaire complexifient les tâches des salariés, avec une obligation de changement de mode de production qui est complexe dans un milieu qui n’attire pas les talents, mais qui est plus un refuge pour les personnes qui ont besoin de travail et n’ayant pas d’ambition professionnelle. Le secteur était plutôt en mode de production segmenté, inspiré du taylorisme, dont McDonald's est l’emblème dans la restauration depuis les années 1960. Dans ce cadre, il n’était pas besoin d’un savoir-faire et d’une connaissance, mais plus d’une cuisine d’assemblage (Ritzer, 2011). Deux cuisines se démarquent par une approche humaniste, en mettant l’enjeu sociétal au sein de leurs préoccupations et en favorisant le bien-être au travail. Le SYREC et le SIRESCO ont mis en place des communautés de pratique (CDP) afin de trouver des solutions en interne aux exigences de ces lois. Notre recherche vise à explorer et comprendre l’évolution du manager de proximité d’un rôle opérationnel à un facilitateur humain en mobilisant les CDP pour accompagner les transformations collaboratives. Nous allons présenter d’abord la littérature sur les CDPs comme moteur d’innovation, leur impact et leur relation avec l’identité professionnelle, nous allons présenter le nouveau rôle du manager de proximité. Dans une deuxième partie, nous allons présenter les nouveaux enjeux de la restauration scolaire ainsi que notre design de recherche : une étude de cas multiples (Yin, 2009) qui s'inscrit dans une perspective d'exploration hybride et repose sur une logique de raisonnement abductif. Les résultats seront ensuite présentés et discutés et montrent l’importance du sens du travail pour la transformation des compétences en innovation
EPH21 Socioeconomic Evaluation of Breast Cancer Attributable to Benzo[a]pyrene (BaP), Nitrogen Dioxide (NO2), and Polychlorinated Biphenyls 153 (PCB-153) Air Pollutants
No full textInternational audienc
A Bayesian hierarchical model of Ellsberg-type preferences
No full textWe consider a Bayesian hierarchical model of Ellsberg-type preferences based on conditional subjective expected utility. In our model, optimism and pessimism emanate from motivated prior beliefs about unobserved outcomes. This implies that optimism and pessimism can only propagate along the structure of the hierarchical model when the probability of outcomes is unknown (ambiguity) rather than known (risk). We show that the prevailing preferences observed in Ellsberg (1961)'s two-urn experiment and Jabarian and Lazarus (2023)'s two-ball experiment are reproduced by our model when motivated priors are pessimistic.</div
Cross-Asset Climate Betas
No full textInternational audienceThis article documents the sensitivity of asset returns to proxies of climate risk. We first construct a novel “extreme weather index” by combining meteorological observations with weather-related catastrophes data. We utilize this index, alongside a news-based indicator focused on climate concerns, to estimate climate “betas” for a cross section of asset classes. We deploy these betas in the context of adapting multi-asset portfolios to shocks in climate events or heightened media attention. We find that introducing new asset classes to a simple equity–bond portfolio, such as commodities, has an outsized impact compared with simply adjusting the type of investment strategy used within a pre-determined asset allocation. These additional asset classes improve portfolio diversification during times of climate stress but introduce a higher degree of tracking error and reduce risk-adjusted performance over the full sample period, highlighting a trade-off for portfolio construction.<br /
Sustainability diffusion in the Chinese semiconductor industry : A stakeholder salience perspective
No full textInternational audienceThe semiconductor sector plays a crucial role in shaping national strategies and driving economic growth; however, it faces significant challenges prompting a shift towards sustainable development. This study aims to investigate whether sustainability initiatives of the focal firm can diffuse throughout the semiconductor supply chain, leveraging stakeholder salience theory and archival data from listed firms in China. Methodologically, we conduct a regression analysis using STATA 17.0 to examine the impact of the focal firm's sustainability disclosure on supply chain sustainability. Findings indicate a positive correlation between the focal company's sustainability disclosure and enhanced sustainability performance of its key suppliers and customers. This relationship is strengthened when the focal firm demonstrates significant market power, sustainability legitimacy, and urgency in addressing sustainability concerns. Our study contributes to the sustainable supply chain management literature by elucidating sustainability diffusion from a stakeholder salience perspective and offers practical insights for semiconductor managers and policymakers striving to foster sustainable practices within the sector.<br/
Does Price Personalization Ethically Outperform Unitary Pricing? : A Thought Experiment and a Simulation Study
No full textInternational audienceMerchants often use personalized pricing: they charge different consumers different prices for the same product. We assess the ethicality of personalized pricing by generalizing and extending an earlier model by Coker and Izaret (Journal of Business Ethics 173:387–398, 2021) who found that price personalization ethically outperforms unitary pricing. Using a simulation analysis, we show that these results crucially depend on the choice of parameters and do not hold universally. We further incorporate additional sources of marginal cost into the utility function that will likely arise from personalized pricing. These include the expectation that personalized pricing is widely considered unfair by consumers who prefer that all consumers are charged the same price (unitary pricing), and that firms often approximate the consumers’ willingness-to-pay in ways that may raise negative sentiments among consumers who feel that their privacy is breached. By extending our model with disutility from unfairness perception and disutility from surveillance aversion, we demonstrate that personalized pricing is quickly outperformed by unitary pricing under social welfare functions that tend to prioritize total utility (utilitarianism and prioritarianism), whereas personalized pricing can ethically outperform unitary pricing under social welfare functions that tend to prioritize equality (egalitarianism and leximin). Our findings illustrate various intricacies and dynamics regarding the circumstances under which personalized pricing can be considered ethical.<br /
Global Carbon Taxation: Analyzing Pollution Effects When Mobile Firms Trade
No full textInternational audienceABSTRACT This paper examines the implications of a global carbon tax within a framework that includes asymmetrically sized countries, imperfectly competitive markets, and mobile, heterogeneous firms engaged in international trade. In the short run, the tax primarily produces Pigouvian effects—raising prices, reducing production, and lowering emissions, which aligns with established literature. In the long run, the mobility of firms introduces additional effects, influenced by trade intensity. Specifically, the tax acts as a dispersion force, encouraging firms to relocate to smaller markets to minimize tax burdens, thus revealing its spatial non‐neutrality across varying market sizes. High trade costs exacerbate this effect, potentially eliminating the most environmentally favorable locations. From a welfare perspective, the tension between consumer surplus and emissions can be mitigated if consumers are environmentally conscious and green policies are complemented by trade policies
Fuzzy classification aggregation
No full textInternational audienceWe consider the problem where a set of individuals has to classify m objects into p categories and does so by aggregating the individual classifications. We show that if m ≥ 3, m ≥ p ≥ 2, and classifications are fuzzy, that is, objects belong to a category to a certain degree, then an optimal and independent aggregator rule that satisfies a weak unanimity condition belongs to the family of Weighted Arithmetic Means. We also obtain characterization results for m = p = 2