Abstract
Making a supply chain more resilient and making it more efficient are often diametrically opposed objectives. Managers have to make informed trade-offs when designing their supply chain networks. There are many methods available to quantify and optimise efficiency. Unfortunately the same cannot be said for vulnerability and resilience. We propose a method to quantify the impact that a supply chain’s dependence on the underlying transport infrastructure has on its vulnerability. The dependence relationship is modelled using multilayered complex network theory. We develop two metrics relating to the unique collection of shortest path sets namely redundancy and overlap. To test the relationships between these metrics and supply chain vulnerability we simulate progressive random link disruption of the urban road network and assess the impact this has on Fully Connected, Single Hub and Double Hub network archetypes. The results show that redundancy and overlap of the collection of shortest paths are significantly related to supply chain resilience, however under a purely random disturbance regime they hold no predictive power. This paper builds a foundation for a new field of inquiry into supply chain vulnerability by presenting a flexible mathematical formulation of the multilayered network and defining and testing two novel metrics that could be incorporated into supply chain network design decisions.
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Notes
In this article kurtosis refers to Pearson’s measure of kurtosis which is the unadjusted fourth standardised moment of a distribution. This is not to be confused with excess kurtosis.
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Acknowledgements
The authors gratefully acknowledge the financial support received from the National Research Fund of South Africa (grant number 105519) during the completion of the research that was foundational to this paper.
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Viljoen, N., Joubert, J. The Road most Travelled: The Impact of Urban Road Infrastructure on Supply Chain Network Vulnerability. Netw Spat Econ 18, 85–113 (2018). https://doi.org/10.1007/s11067-017-9370-1
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DOI: https://doi.org/10.1007/s11067-017-9370-1