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International audience; Supplier reliability is a critical issue for manufacturing companies. Delivery delays from suppliers create backlog and firefighting on the shop floors. To avoid disruption and hedge against supplier lead time uncertainty, companies rely on diversification, multi-sourcing, and safety lead times. In multi-sourcing, the buyer might order the same product (raw material) from different suppliers. The design of a robust and cost-efficient purchasing/ordering plan in multi-sourcing is a complex task which has a strong impact on the performance of the company. In this study, we investigate the use of robust optimization for the integrated lot-sizing and supplier selection problem under lead time uncertainty. More specifically, we use polyhedral budgeted uncertainty sets. The resulting model determines the ideal lot sizes to minimize the total costs taking into consideration suppliers’ reliability and prices. To solve this problem, a row and column generation approach is proposed. To alleviate scalability issues, we enhance the row and column generation through a robust counterpart formulation, and we propose an efficient fix-and-optimize approach. Our extensive computational experiments show that the fix-and-optimize approach yields good quality solutions within a reasonable amount of computational time. We provide insights into supplier diversification based on the risk profile of the decision-maker. One of the conclusions is that an extremely risk-averse decision-maker selects a single supplier, namely the most reliable one even if it does not offer the lowest price.

International audience; Due to the complexity and the magnitude of optimisation models that appeared in sustainable supply chain management (SSCM), the use of meta-heuristic algorithms as competent solution approaches is being increased in recent years. Although a massive number of publications exist around SSCM, no extant paper explicitly investigates the role of meta-heuristics in the sustainable (forward) supply chain. To fill this gap, a literature review is provided on meta-heuristic algorithms applied in SSCM by analyzing 160 rigorously selected papers published by the end of 2020. Our statistical analysis ascertains a considerable growth in the number of papers in recent years and reveals the contribution of 50 journals in forming the extant literature. The results also show that in the current literature the use of hybrid meta-heuristics is overtaking pure meta-heuristics, the genetic algorithm (GA) and the non-dominated sorting GA (NSGA-II) are the most-used single- and multi-objective algorithms, the aspects of sustainability are mostly addressed in connection with product distribution and routing of vehicles as pivotal operations in supply chain management, and last but not least, the economic-environmental category of sustainability has been further noticed by the scholars. Finally, a detailed discussion of findings and recommendations for future research are provided.

International audience; We use a novel measure of firm-level political risk based on a textual search technique on firms' quarterly earnings conference transcripts to explain dividend payouts in publicly listed U.S. firms. We find a positive and significant effect of firm-level political risk on dividend payouts, particularly in uncertainties related to economics, institutions, technology, trade, and security. The effect is more pronounced in firms with better corporate governance, less analyst follow-up, and higher growth opportunities. These results support the signaling role of dividends rather than the role of agency theory in explaining dividend payouts when firms are associated with higher levels of political risk. We also find the effect to be prominent after controlling for an aggregate measure of economic policy uncertainty and in poor economic conditions and in major political event periods. We address endogeneity concerns by running placebo tests and conducting instrumental variable analysis and we alleviate self-selection bias by performing propensity score matching technique.

National audience; La recherche autour des problèmes de découpe et de packing, comme le Cutting Stock Problem (CSP), est active depuis plus de 50 ans. De nouvelles variantes continuent pourtant à émerger. C'est le cas du problème de découpe avec chutes réemployable (Cutting Stock Problem with Usable Leftovers, CSPUL), qui étend le CSP en tenant compte du réemploi possible des chutes de production. Cette variante permet ainsi d'apporter une réponse aux préoccupations environnementales, aux tensions sur la chaine d'approvisionnement et à l'augmentation du coût des matières premières. Nous présentons un état de l'art sur les différents modèles de CSPUL, les méthodes de résolution et leurs applications industrielles.

International audience; We model and solve a production planning problem over a discrete-time horizon of a biorefinery that treats different types of biomass and transform them either into bioenergy or biofuel. Both biomass and biofuel can be stored. Storage of biofuel serves to match the supply with the demand of both bioenergy and biofuel. Deterioration of biomass, which was rarely studied in the bioenergy production literature, is modeled and its impact on storage decisions is analyzed. The proposed model has two main characteristics: (i) controlling inventory of the perishable biomass while considering different ages for the stored biomass and (ii) biomass can be transformed into either bioenergy or biofuel, which in turn can be stored and then transformed into bioenergy. The applicability of the developed model is shown through several numerical experiments. The results show that first, perishability can lead to profit losses that cannot be neglected. Second, there is a threshold value on the perishability rate above which perishability does not have any longer impact on the profit. Third, storage and transformation of biofuel results in considerable increase in profit and smoother production at the facility even when there is a high fluctuation in price and demand. Fourth, when the decision maker imposes a maximum age on biomass to enhance quality and reduce health risks, the model provides guidelines on how to make this decision with the lowest impact.

International audience

International audience; While extending the scarce literature on determinants of corporate social responsibility (CSR) decoupling, we examine the impact of CEO power on CSR decoupling. Using panel data of US firms for 2002–2017, we find that CEO power increases CSR decoupling. Our results remain consistent after controlling for the endogeneity problem. Aligned with the managerial power theory, our results suggest that firms with powerful CEOs are more likely to manage CSR performance through decoupling.

book, voir url dans champ "Voir aussi"; International audience; We study the single item lot-sizing problem with supplier selectionand uncertain lead time. We consider the situation where a companyhad preselected a set of suppliers for an item, and these suppliers havedifferent prices, different lead times, but also different reliability. Weaim to provide a robust optimization approach to decide when to order,how much to order, and from which suppliers, in the context of un-certain delivery lead time. We formulate the robust optimization prob-lem with polyhedral budgeted uncertainty sets. This formulation doesnot require assumptions on order crossovers, order splitting, or on thestructure of the demand or lead times. We propose an exact row andcolumn generation algorithm to solve the considered problem, alongwith some enhancements including a fast cut generation procedure. Toimprove the scalability of the approach we propose several heuristics,including a hybrid of the robust counterpart reformulation and row andcolumn generation, and a fix-and-optimize approach in the row andcolumn generation framework. Experimental results show that the fix-and-optimize approach provides good results. Finally, we provide in-sight into the reaction of the decision-maker to unreliable suppliers.One of the conclusions is that in the considered framework, an ex-tremely risk-averse decision-maker selects a single supplier, namelythe most reliable one even if it does not offer the lowest price.

International audience; In a context of vegetablization of meals, a range of plant-based substitutes is developing that imitate the taste and nutritional properties of meat products. Moreover, the motivations to reduce the consumption of meat products or to replace them by plant-based substitutes are based on several arguments such as health, environment or animal welfare. Through two studies, we explore the preferences for plant-based meat substitutes by combining the tools of sensory evaluation with those of experimental economics. Thus, subjects taste real products and express themselves about them, then they are exposed to choices related to these products (maintaining consumption or returning to their usual product). Our results show that a third of the participants appreciate the substitutes and are ready to renew their consumption.; Dans un contexte de végétalisation des repas se développe une offre de substituts végétaux imitant les propriétés gustatives et nutritionnelles des produits carnés. Par ailleurs, les motivations à réduire la consommation de produits carnés ou à les remplacer par des substituts végétaux repose sur plusieurs arguments tels que la santé, l’environnement ou le bien-être animal. A travers deux études, nous explorons les préférences pour des substituts végétaux à la viande en associant les outils de l’évaluation sensorielles à ceux de l’économie expérimentale. Ainsi les sujets dégustent des produits réels et s’expriment à leur sujet, puis ils sont soumis à des choix relatifs à ces produits (maintient de la consommation ou retour à leur produit habituel). Nos résultats montre qu’un tiers des participants apprécient les substituts et qu’ils sont prêt à en renouveler la consommation.

International audience

PurposeThe purpose of this study is to investigate the impact of policy uncertainty on firm performance and to examine how the different cultural societies deal with the policy-induced uncertainty.Design/methodology/approachThe authors use data of European non-financial firms to extend the growing literature on policy uncertainty, firm performance and national culture. The authors consider financial as well as market proxies to measure firm performance and use Hofstede's cultural dimensions as a proxy for national culture. The authors apply the generalized method of moments (GMM-system) regression technique on a dataset of 702 non-financial European firms, listed during the period 2002–2018.FindingsThe authors find overwhelming evidence that policy uncertainty reduces the performance of the European firms; however, cultural differences among different European countries moderate the impact of policy uncertainty on the financial as well as the market performance of the firms. The results of this study show that European cultures with high power distance, individualism, masculinity and indulgence efficiently deal with the economic policy uncertainty. While the European societies with high uncertainty avoidance fail to cope with policy-induced uncertainty. The results are robust to different regression models, alternate proxies of firm performance and endogeneity issues.Practical implicationsThe authors argue that policy uncertainty increases information asymmetry and decreases firm performance, therefore, the policymakers shall be considerate of the consequences of the policy-induced uncertainty in the society and business arena that would not only adversely affect the firms but also the economy.Originality/valueTo the best of the authors' knowledge, this is the first study that investigates the role of national culture on the relationship between policy uncertainty and firm performance in the European context.

PurposeThis paper, using a case study on Jibu, a water distribution chain that distributes bottled water in Africa, aims to underline the importance of social relationships and communication within franchise chains operating in the social sector in developing countries and their contribution to the clarification of the concept of social franchising.Design/methodology/approachThe research is based on a case study of Jibu, a water distribution chain composed of 122 franchised units and 2,100 independent retailers. The primary data were gathered through an analysis of in-depth interviews with 67 people (Jibu co-founder, headquarters staff, franchisees, micro-franchisees and customers) in Uganda and Rwanda.FindingsThe findings showed that the extent and richness of social relationships and communication existing within the Jibu chain are not limited to top-down and build a feeling of belonging to a family. These social relationships and communication are key characteristics of social franchising.Practical implicationsThis research can assist franchise experts, franchisors and franchisees to better assess the importance of social relationships and communication in social franchise chains in developing countries and help national and local governments better understand how franchising works in the social sector.Social implicationsFranchising is not limited to hotels, restaurants and retail businesses. Franchising can be applied to businesses that have social goals, in addition to profit goals. For example, the Jibu franchise is a relevant and efficient solution to providing the African people with access to drinking water at an affordable resale price. This paper, thus, contributes to increasing the awareness of this franchising phenomenon in social sectors in developing countries and in Africa, in particular.Originality/valueAccess to drinking water is an important issue in many developing countries, above all in African countries. Franchised water services are an innovation in terms of a business model in developing countries with micro-treatment plants run by franchisees and small units run by micro-franchisees or retailers, both franchisees and micro-franchisees being local entrepreneurs.

International audience; In this paper, we study the gains and losses incurred during the COVID-19 pandemic. We distinguish between the effects of the pandemic and those of the health measures implemented to reduce the death toll, notably "the lockdown." Our theoretical model is focused on within-sector firm heterogeneity and involves imperfect competition in a partial equilibrium setting. A comparison between the gains and losses triggered by both the pandemic and the lockdown indicates that an excess profits tax imposed on the "winners" could partly compensate the "losers" of the same sector.

Whilst fundamental to human societies, collective decision-making such as voting systems can lead to non-efficient decisions, as past climate policies demonstrate. Current systems are harshly criticised for the way they consider voters needs and knowledge. Collective decision-making is central in human societies but also occurs in animal groups mostly when animals need to choose when and where to move. In these societies, animals balance between the needs of the group members and their own needs and rely on each individuals (partial) knowledge. We argue that non-human animals and humans share similar collective decision processes, among which are agenda-setting, deliberation and voting. Recent works in artificial intelligence have sought to improve decision-making in human groups, sometimes inspired by animals decision-making systems. We discuss here how our societies could benefit from recent advances in ethology and artificial intelligence to improve our collective decision-making system. published

Purpose This paper aims to explore how the power of salient stakeholders involved in the green waste management of franchise chains can impact the ability of the chains to change their green practices. Design/methodology/approach This qualitative study is based on interview data from 19 franchisors and their head office staff operating in the fast-food sector in France where franchise chains have been ‘named and shamed’ as continuing to ignore waste management regulation. Findings The findings suggest that both the form and bases of power of different stakeholder groups have important implications for the implementation of green practices, even those required by law. The authors find that the franchisees’ central network position alters the ability of franchisors to directly engage in dialog, consult with, and educate key stakeholders, creating additional challenges for franchisors in the implementation process. Research limitations/implications The qualitative nature of the study limits the extent to which the findings can be generalized. Future studies could develop an instrument to assess franchisor perceptions of stakeholder power. Practical implications The findings suggest that franchisors should consider carefully how they communicate changes to green practices to their franchisees to ensure not only their compliance but also their motivation to engage with those stakeholders with whom they have regular interactions. The findings can also help governments to better understand how to involve other stakeholders to ensure effective environmental legislation. Originality/value The study is the first, to the authors’ knowledge, to consider the role of stakeholders in the implementation of green practices in franchise chains. By examining franchise chains, this paper provides new insights into the role of an additional stakeholder, the franchisee, and enriches the literature on green practices in the hospitality sector.

International audience; One of the most applied value scales in research is personal shopping value (PSV) by Babin, Darden, and Griffin (1994). PSV assesses consumers’ shopping experiences along hedonic and utilitarian value. The purpose of this research is the corroboration of the original article and the PSV scale to investigate the impact of the past 25 years on the scale’s dimensionality and item composition. The corroboration mirrors the original store environment, while an extension additionally considers two contemporary shopping environments: online websites and mobile apps. Results across six studies confirm shopping value’s two-dimensional structure of work and fun. However, individual items capturing hedonic and utilitarian value deviate from original PSV scale items in number and nature for current stores, online, and mobile apps environments. Researchers and practitioners should exhibit caution to blindly administer or adapt measures without considering temporal or contextual aspects of the scale that limit its applicability.

International audience; Since the start of the oil counter-shock in June 2014, Algeria has experienced unprecedented twin deficits. The excessive monetisation of the public deficit coupled with other deep anomalies in the economy of this country acutely calls for reconsideration of its monetary policy. To this end a prior study of the long-run stability of money demand is needed. We estimate the demand for money for monetary aggregates M1 and M2, and cash in Algeria over the period 1979–2019, and study its long-run stability. We show that the transaction motive is significant for all three aggregates, especially for the demand for cash, reflecting the weight of informal economy “practices”. The elasticity of the scale variable is very close to unity for M2 and M1, and even equal to unity for cash demand (1.006). The elasticity of inflation is also significant for all three aggregates, although its level is higher in the case of cash demand (−6.474). Despite the persistence of certain financial repression mechanisms, interest rate elasticity is significant for all three aggregates, but higher for M1 and cash. The same observation is made for elasticity of the exchange rate, reflecting the effect of monetary substitution, especially for M1 and cash. Finally, our study concludes that the demand for money in terms of M1 remains stable, the same observation being confirmed for the M2 aggregate. However, the demand for fiat currency proves not to be stable. The consequences for the optimal design of monetary policy in Algeria are clearly stated.

International audience; Taking an inductive approach, this paper explores a key question with respect to tourists' meaning creation: What is the role of servicescapes in the development of place meanings for tourists? The research is situated in place and appropriation theory and leverages a large two-phase qualitative study on tourists' restaurant experiences in Brittany, an important tourism destination in the North-West of France. Analysis of the narrative data uncovers four dimensions of restaurant servicescapes that contribute to place meaning. These are: The Interior Environment; The Service Offer; The Social Environment, and the Restaurant Exterior. Furthermore, the research provides insights into the ways tourists connect servicescapes to destinations through physical and sensorial immersion, investigation, and learning. This research can help practioners in creating more meaningful holiday experiences and in branding and promoting tourism destinations. It opens the way for the exploration of the role other tourism services in the development of meaningful tourism experiences.

International audience; Recent market studies showed that the demand for organic and local agrifood products is increasing despite their higher prices. The agribusiness actors should therefore rethink the supply chain configuration to cope with new market trends characterized by the rise of the organic segment and the increase of consumers' preference to more local products. This study focuses on the olive oil sector and proposes a mixed-integer non-linear optimization model for the design of olive oil supply chains while incorporating organic and conventional market segments and considering, for each segment, a supply chain proximity- and price-sensitive demand. The model is developed with the collaboration of olive oil producers in the Mediterranean area. Thanks to this industrial collaboration, we account for real-world practices and constraints and apply the model to a realistic case study. We first linearize the model and show that it can be efficiently solved with commercial optimization softwares. Based on numerical experiments, we derive a series of managerial insights that are applicable to the considered case study, some of them are not intuitive. For instance, we show that an increase in consumers’ preference to more local products may lead the producer to offer products with a more global supply chain. The conventional product variety may be produced with a more local supply chain than the organic (premium) variety. Finally, offering a mix of organic and conventional varieties instead of only one variety would lead to implementing a more local supply chain.

International audience; Although franchise chains are increasingly committed to environmental, social, and societal transitions, only a few researchers have focused on Corporate Social Responsibility (CSR) in the specific case of franchising. The aim of our paper is to discuss the specificities and challenges of CSR in franchising, explore how franchisors report on their sustainable practices, and emphasize subsequent directions for future research. In order to do so, we focus on the Corporate Social Disclosure (CSD) practices of twenty-two retail and service franchisors operating in the French market where regulations of non-financial information disclosures exist for large companies. Our findings show that these franchisors disclose rich and diversified information about their CSR activities. However, franchisors’ disclosures can vary significantly, especially depending on their chain size and whether they are subject to reporting regulations. Our research contributes to the literature on CSR in franchise chains, as well as the practice.

Purpose Buoyed by the desire to reduce carbon dioxide emissions and develop sustainable urban transportation, the dockless bike-sharing industry boomed in China during 2017–2018. To the surprise of the stakeholders, this industry dramatically ebbed in 2019. The dockless bike-sharing system deviated from a problem-solver to a troublemaker in a very short period. The oversupplied and excessively discarded shared bikes caused a big waste of resources and serious pollution to the environment. In this paper, the decision-making of the key players of the industry, i.e. business operators, investors, customers and government, is analyzed through the lens of the cognitive bias. This paper aims to illuminate the process of how this innovative transport solution turned to a disastrous ending, which caused damage to urban environment and financial loss to investors. Design/methodology/approach In this study, a qualitative analysis based on the rich secondary data sources is conducted. A rich amount of qualitative data including news reports, government policies, consulting reports and companies’ annual reports etc. were collected. Findings The study shows, in the product introduction period, the government, business operators, investors and consumers fell into the cognitive bias. They over focused on the positive side such as high-tech, eco-friendly, convenient image of the dockless bike-sharing solution. Thereby, the key stakeholders made irrational decisions in product adoption and management. This study moves toward increasing key stakeholders’ awareness of the imperative to reduce these biases when promoting eco-innovations. This study also recommends a prudent attitude with a rational and comprehensive thinking style in dealing with eco-innovation and the emerging sharing economy. Originality/value To solve the cognitive biases, this study recommends that people use rational decision-making style to examine and adopt the dockless bike-sharing solutions. Practical recommendations to tackle the existing recycling crisis of the dockless bike-sharing industry are also discussed.

International audience; The purpose of this paper is to identify which environmental criteria can influence the product demand in a context of business-to-business. These criteria can be related to the product's environmental characteristics, to the organization strategies or green practices developed by the firms and to the supplier selection process.Building the conceptual framework from the literature review, a set of environmental criteria were extracted, selected and validated. These criteria were used as a basis for the definition of a questionnaire survey that was sent to 5820 professionals from the food industry in France. The analysis of the 248 complete answers shows that the environmental characteristics of the product can influence product's demand. The most influential attribute to improve the product's environmental quality that increases the product's demand is the introduction of organic labelled raw materials. Besides, the practices that influence mostly the product demand are related to the geographical proximity with the stakeholders. Moreover, the results show that the most important selection criterion when choosing a supplier is the importance given to the quality and environmental performance of components offered. Hence, we show that in the French food market, as opposite to what is usually assumed in many research works, the carbon emissions yield during the production process and transportation process have still no significant impact on products' demand. Lastly, in this work, we quantify the demand increase that company can achieve when enhancing the environmental quality of its products. We show that the impact of the enhancement of those criteria on the demand can have different aspects. 55.6% of respondents advocate for a demand increase and most of them (33.6%) estimate this increase between 5 and 10% of the initial demand. Finally, some respondents (4.8%) indicate that the enhancement of environmental quality does not necessarily increase the demand. However, without efforts to enhance the environmental quality of their products, the demand can decrease.These findings allowed concluding that the business-customers are becoming more and more exigent by privileging organic labelled and local products and making that the companies analyse the geographical proximity with the stakeholders as a key factor during the selection process. We provide companies managers in food industry with better understanding about the environmental criteria that increase the products demand helping them to target the right decisions and to be efficient in their process of environmental quality enhancement. We also assess and try to quantify and give an estimation about the demand evolution regarding the enhancement of product's environmental quality. Our findings are also helpful for Operational Research community.

International audience; In the context of the mainstream of globalisation and a new trend of slowbalisation, we review the existing literature including both empirical and analytical papers on the sourcing and location decisions in Supply Chains. After defining the different sourcing strategies, e.g., insourcing, outsourcing, offshoring and reshoring, we present the drivers for each strategy and how they can be incorporated in the analytical models in order to help to optimize the taken decisions. We also discuss the research perspectives in the field.

International audience; The current paper uses the concept of imaginaries to understand how permaculture provides alternative ways of organizing in response to the Anthropocene. We argue that imaginaries provide ways of organizing that combine ideas and concrete practices, imagining organizational alternatives by enacting new forms of collective practice. Permaculture movements, because of their combination of local, situated design practices and underlying social and political philosophies, provide an interesting case of imaginaries that make it possible to reimagine the relations between humans, non-human species and the natural environment. We identify and describe three imaginaries found in permaculture movements, conceiving of permaculture, respectively, as a technical design practice, a holistic life philosophy, and an intersectional social movement. These imaginaries open up possibilities for political and social alternatives to industrially organized agriculture, but are also at risk of various forms of ideological co-optation based on their underlying social premises. We discuss our perspective in terms of developing the concept of imaginaries in relation to organizational scholarship, particularly in contexts where fundamental relations between humans and the natural environment must be reimagined, as in the case of environmentalist organizing in response to the Anthropocene.

International audience; Conflicts are common in franchising, however, they become dysfunctional above a certain threshold. Our aim is to understand how conflict management processes and, in particular, problem solving, persuasion, bargaining and politics, are developed and implemented within franchise chains and how they contribute to franchisors’ organizational capabilities. We do so through a qualitative study based on 44 in-depth interviews with franchisors and franchisees operating in France. Our main findings show that the implementation of these conflict management processes over time and with various franchisees nurture conflict management capabilities of franchisors.

How are prices and market outcomes determined on peer-to-peer platforms? More importantly, how should we expect price-setting and demand behavior to change as these markets mature? We provide the first empirical analysis of the world’s leading carsharing platform, BlaBlaCar. Our econometric model explicitly accounts for the joint determination of price and quantity demanded and finds that pricing decisions evolve as drivers gain experience with the platform. More-experienced drivers set lower prices and, controlling for price, sell more seats. Our interpretation is that more-experienced drivers on BlaBlaCar learn to lower their prices as they gain experience. Further, we find that driver demographics matter. The demographic characteristic with the quantitatively largest effect is for drivers with an Arabic-sounding name, for whom there is meaningfully lower demand, despite the fact that these drivers set lower prices. In total, our results suggest that peer-to-peer markets such as BlaBlaCar share some characteristics with other types of peer-to-peer markets such as eBay but remain a unique and rich setting in which there are many new insights to be gained.

International audience; The current article examines the experience of middle management through the concept of boundary work, characterized as the work of negotiating between multiple roles in the interstices of organizational groups. Through an ethnographic study of a Brazilian accounting firm, we explore the ambivalent experience of boundary work as characteristic of professional middle managerial workers. Our managers described themselves as proactive and reflexive agents, on the one hand, yet also as lacking autonomy and a sense of belonging, on the other. We examine this tension as a contrast between forces of emancipation (i.e. sense of mastery, autonomy, empowerment and reflexivity) and alienation (i.e. fatigue, lack of self-determination, and detachment from their profession and coworkers). We discuss these forces and their implications for managerial work in the light that, in our findings, managers routinely shift between being agential and reflexive mediators (boundary subjects) and interfacing and coordination devices (boundary objects).