Multiple order-up-to policy for mitigating bullwhip effect in supply chain network

This paper proposes a multiple order-up-to policy based inventory replenishment scheme to mitigate the bullwhip effect in a multi-stage supply chain scenario, where various transportation modes are available between the supply chain (SC) participants. The proposed policy is similar to the fixed order-up-to policy approach where replenishment decision “how much to order” is made periodically on the basis of the predecided order-up-to inventory level. In the proposed policy, optimal multiple order-up-to levels are assigned to each SC participants, which provides decision making reference point for deciding the transportation related order quantity. Subsequently, a mathematical model is established to define optimal multiple order-up-to levels for each SC participants that aims to maximize overall profit from the SC network. In parallel, the model ensures the control over supply chain pipeline inventory, high satisfaction of customer demand and enables timely utilization of available transportation modes. Findings from the various numerical datasets including stochastic customer demand and lead times validate that—the proposed optimal multiple order-up-to policy based inventory replenishment scheme can be a viable alternative for mitigating the bullwhip effect and well-coordinated SC. Moreover, determining the multiple order-up-to levels is a NP hard combinatorial optimization problem. It is found that the implementation of new emerging optimization algorithm named bacterial foraging algorithm (BFA) has presented superior optimization performances. The robustness and applicability of the BFA algorithm are further validated statistically by employing the percentage heuristic gap and two-way ANOVA analysis

Social Media as a Form of Virtual Whistleblowing: Empirical Evidence for Elements of the Diamond Model

This article originally advances the field of organizational whistleblowing by empirically investigating the suitability of the four elements of the fraud diamond as a means to understand the intention to disclose wrongdoing through virtual channels. This article also makes a contribution on the theme of whistleblowing as it relates to customers, an under-studied, however, relevant stakeholder in this field. The main findings of the article are as follows: (a) the four elements of the fraud diamond as they relate to whistleblowing—a combination of pressure, financial incentive, opportunity and rationalization, and capability—can explain the intentions behind customer reports of wrongdoing; (b) online social media channels are customers’ preferred means of whistleblowing; (c) the elements of opportunity and capability are strongly correlated with the use of social media as a method of disclosing wrongdoing; and (d) virtual channels can be useful for whistleblowers in order to avoid potential retaliation. Unique managerial and academic implications of these research findings are also discussed, extending the layers of knowledge on whistleblowing in organizations