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PurposeThe purpose of this research is to provide a theoretical explanation of the strategic and structural changes occurring in US omnichannel retail supply chains. Using longitudinal data, the research documents transitions in retailers' supply chain strategies, specifically related to the order fulfillment process. It further offers explanation for how and why these transitions occurred.Design/methodology/approachThis research uses a process theory lens to explain the business model transformation of the omnichannel order fulfillment process. Using a case study approach, a longitudinal multicase study was conducted with six large US retailers over a span of 10 years. Within-case and cross-case analysis identifies the sequence and rationale of different strategic and structural shifts in retailers' omnichannel order fulfillment strategy.FindingsThe within- and cross-case analyses offer insight into how the transitions occur, at what rate they occur across several different retailers, and why the rate can differ across the stages of omnichannel transition among retailers. The research documents that retailers took varied approaches to strategically develop and structurally change their order fulfillment processes in their transition to omnichannel retail. The findings reveal that these approaches are dependent on retailers' store-based logistics capabilities and specific supply chain arrangements within their retail segment.Research limitations/implicationsThe longitudinal and theoretically driven approach provides researchers a better understanding of the business model transformation in US retail omnichannel operations. This approach builds theoretical context around why and how strategic and structural changes in omnichannel fulfillment occurred over time. It also explains the underlying omnichannel phenomenon more accurately than research focused on discrete changes at a single point in time.Practical implicationsThe findings and managerial insights can assist practitioners in understanding how environmental changes have led to strategic and structural shifts across different stages of omnichannel fulfillment evolution. These insights also provide guidance to retailers that are currently in early stages of developing their omnichannel fulfillment strategy.Originality/valueLogistics and fulfillment operations of retailers have changed dramatically over the last 10–15 years. The authors apply a process theory lens to explain how and why retailers have integrated their channels to achieve omnichannel success at the store level.

PurposeThe purpose of this paper is to extend existing and motivate future sustainable supply chain management (SCM) and logistics research by examining a structure-conduct-performance framework linking resource commitment to sustainable SCM, reverse logistics, and operational performance. A sustainable reverse logistics capability is investigated as mediating the performance benefits associated with resource commitments to sustainable SCM.Design/methodology/approachSurvey methods and structural equation modeling were used to collect and analyze data from 180 supply chain professionals.FindingsThe results of a mediated model suggest that resource commitments may be used to develop a sustainable reverse logistics capability, reducing the environmental impact of reverse logistics activities. A strong sustainable reverse logistics capability results from resources committed specifically to sustainable reverse logistics and a commitment to the sustainability of the supply chain.Research limitations/implicationsThis study applied a purposefully general sampling procedure. Specific industries may have additional constraints (e.g. risk, transparency, governance factors) that directly impact reverse logistics. These constraints are limitations of the study as well as opportunities for future research. Resource commitment is critical to the success of an overall firm strategy to build a sustainable supply chain, especially when considering reverse logistics.Practical implicationsAs managers examine the benefits of sustainable SCM, they must consider the resources required. For firms engaging in sustainable SCM, developing a sustainable reverse logistics capability is a key success factor for improved performance.Originality/valueGiven the growing acceptance and importance of sustainable SCM, this research provides insights to managers and academics regarding the key mediating role of a sustainable reverse logistics capability when integrated into existing and future supply chain research frameworks and processes.