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Introduction
Supply chain resilience has become an increasingly prominent concern in operations management scholarship and practice, particularly in the context of geopolitical disruption, pandemic-related supply shocks, and the growing complexity of global value chains. As argued by Ponomarov and Holcomb (2009, p. 131), resilience in this context refers to the adaptive capability of a supply chain to prepare for unexpected events, respond to disruptions, and recover from them by maintaining continuity of operations. This essay critically evaluates the supply chain vulnerability arising from sole-supplier dependency, applying Resource Dependence Theory to a specific operational case and developing evidence-based recommendations.
Resource Dependence Theory and Supply Risk
According to Pfeffer and Salancik (1978), organisations become strategically vulnerable when they rely on a single external source for a critical resource, because this dependency transfers power to the supplier and reduces the buying organisation's ability to respond to supply disruptions. Resource Dependence Theory (RDT) predicts that sole-source arrangements generate asymmetric power relationships in which the supplier can extract value through price increases, extended lead times, or reduced service levels, with the buyer having limited recourse. As observed by Zsidisin and Ritchie (2009), this theoretical prediction is consistently supported by empirical evidence from manufacturing, retail, and healthcare supply chains, where sole-source dependency has been associated with higher input costs and greater exposure to disruption risk.
In the case under examination, the firm sources eighty per cent of a critical electronic component from a single tier-one supplier, with no alternative qualification in place. This arrangement satisfies RDT's definition of critical resource dependency and generates the vulnerability profile the theory predicts. The concentration of supply creates a single point of failure that is particularly concerning given the component's centrality to the firm's production process and the twelve to sixteen week lead time required to qualify an alternative supplier under the relevant technical standards.
Simulation Evidence
The vulnerability identified theoretically is quantified by the simulation data presented in the firm's own operational review. When the supplier was modelled in a disrupted state for fourteen consecutive days, the simulation projected a production shortfall of approximately forty thousand units, representing an estimated revenue impact of two million pounds at current selling prices. A dual-sourcing scenario modelled within the same analysis reduced the projected shortfall to eight thousand units, a reduction of eighty per cent, demonstrating that diversification of supply substantially contains the downside risk without requiring a complete redesign of the supply chain architecture.
As indicated by Sheffi and Rice (2005), firms that invest in supply chain flexibility, defined as the capacity to respond to disruptions by switching between sources, routes, or production methods, consistently recover from disruption events more rapidly and at lower cost than those that have optimised purely for efficiency. The simulation findings align with this empirical generalisation and provide a quantitative basis for the dual-sourcing recommendation.
Critical Evaluation
It is important to recognise, however, that dual sourcing involves costs that must be weighed against the resilience benefits. As noted by Tang (2006), maintaining multiple qualified suppliers requires additional investment in supplier development, quality assurance, and contract management, and may reduce the volume discounts available from the primary supplier. These costs are real and should not be dismissed in the analysis. Nevertheless, as demonstrated by the simulation evidence, the expected value of the disruption risk under current arrangements substantially exceeds the estimated ongoing cost of dual sourcing, providing a clear net economic case for the investment.
Conclusion
In conclusion, the firm's current sole-supplier arrangement creates a supply chain vulnerability that is both theoretically predictable under Resource Dependence Theory and empirically quantified by the simulation evidence. As argued by Pfeffer and Salancik (1978), and as confirmed by the operational data, dependency on a single critical supplier transfers power asymmetrically and exposes the firm to disruption costs that are disproportionate to any efficiency gains from supply concentration. Dual sourcing represents the primary recommendation, supported by a phased supplier qualification programme that addresses the lead time constraints identified in the analysis.