International audienceCurrently companies are looking for solutions to reduce carbon emissions associated with their operations. Operational adjustments, such as modifications in batch sizes or order quantities, have proven to be an effective way to decrease emissions. In this paper, a novel model is proposed that takes into account the link between an inventory policy (EOQ), total carbon emissions, and both price and environmental dependent demand. In the case of an exogenous price, two optimal quantities are determined which maximize a retailer's profit and which minimize carbon emissions. Conditions that allow a company to maximize profit while minimizing emissions and mechanisms that allow a firm to maximize its profit and to decrease its carbon emissions are determined. In the case of an endogenous price, some empirical results are also discussed. When a firm optimizes its profit through both its selling price and its order quantity, some experiments match empirical observations. On the one hand, an environmental strategy is more significant for cheaper and green-labeled products. On the other hand, a public mechanism such as a carbon tax will decrease total and marginal emissions

Compréhension du DDMRP et de son adoption : premiers éléments empiriques Le Demand Driven Material Requirements Planning (DDMRP) est une méthode récente de gestion de production dont la presse professionnelle met régulièrement en avant les exemples d'implantations réussies en entreprise. Elle propose une alternative aux méthodes traditionnelles de gestion de la production, en se basant sur un dimensionnement dynamique de stocks positionnés à des points stratégiques de découplage et un fonctionnement tiré par la demande réelle. Le lancement des productions, des achats ou des transferts inter-sites ne se fait plus directement à partir de prévisions, mais selon un planning visuel adapté en temps réel, basé sur des codes couleurs de criticité et de priorité : vert, jaune ou rouge. L'objet de cet article est de décrire le fonctionnement de cette méthode, de définir ses limites, et de comprendre, à travers l'étude de 30 cas pratiques, les raisons poussant les entreprises à l'implémenter. Demand Driven Material Requirements Planning (DDMRP) is a recent production planning and control (PPC) system. It is a subject of interest to the professional press. Indeed, numerous articles highlights cases where the implementation of the DDMRP has succeeded. The demand-driven system and the dynamic dimensioning of decoupled points (resulting from a strategic inventory positioning) bring the DDMRP as an alternative to the traditional PPC system. Forecasts are no longer the signal to release the production, purchase and intra company stock transfer order. Instead, DDMRP provides signals based on priority and critically colors: green, yellow and red; collected in a visual planning updated in real-time. The aim of this article is to describe how this method works, define its limits, and understand the reasons why companies choose to implement it.

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