The Role of Sustainability Practices in Enhancing Supply Chain Efficiency: An Investigation of Supply Chain Integration and Supplier Diversity in Pakistan

Abstract

This study examines the direct effect of Supply Chain Integration (SCI) and supplier diversity (SD) on Supply Chain Efficiency (SCE) and the mediation effect of Sustainability Practices (SP) in the context of Pakistan's industry. The study is guided by a multi-theoretical framework, which combines the Resource-Based View, Transaction Cost Economics, Stakeholder Theory, Dynamic Capabilities, Relational View, and Institutional Theory. A quantitative cross sectional survey design was used, and 325 valid responses were obtained from medium and large organizations located in Karachi, Lahore, Faisalabad and Islamabad from supply chain managers, procurement officers and logistics professionals. The analysis of data was performed using SPSS, and mediation hypotheses were tested using the PROCESS macro (Model 4, 5,000 bootstrap samples, bias-corrected confidence intervals). The results strongly support all four of the hypotheses. The direct positive impact of SCI on SCE is significant, in terms of decreased costs, lead times, and operational waste. There is also a strong positive direct impact of SD that is manifested through flexibility, innovation and resilience. More importantly, sustainability practices serve as the link between the two relationships: integration creates opportunities for collaborative platforms for integrated environmental and social efforts, and supplier diversity provides an additional source of sustainability portfolio diversity through indigenous and green practices that together can have a larger impact on efficiency gains. Theoretically, the study extends the nomological network of supply chain efficiency by providing empirical support for sustainability as a mediator between the performance effects of integration and diversity. In fact, it provides a data-informed framework for Pakistani managers to harness integration, diversity and sustainability as a means of boosting operational performance and for policymakers to provide evidence-based incentives for SME integration and green supply chains. Although there are limitations in the cross-sectional and single-informant nature of the study, the model can be replicated for future studies regarding sustainable performance of supply chains in emerging economies.