Trends in management towards a concentration on core competencies and outsourcing of non-core activities have created complex networks, i.e., global supply chains. At the same time, it has been discussed that this increased complexity has also made companies more vulnerable. An interesting paper, Structural Drivers of Upstream Supply Chain Complexity and the Frequency of Supply Chain Disruptions, co-authored by Bode and Wagner, is currently forthcoming in the Journal of Operations Management. Herein, the authors distinguish between three drivers of upstream supply chain complexity: (1) horizontal complexity (= the number of direct suppliers in a firm’s supply base), (2) vertical complexity (= the number of tiers in the supply chain), and (3) spatial complexity (= the geographical spread of the supply base). Based on survey data, the authors find that all of these three drivers increase the frequency of supply chain disruptions. It is further found that these three variables even amplify each other’s effects in a synergistic fashion.
Bode, C., & Wagner, S. (2015). Structural Drivers of Upstream Supply Chain Complexity and the Frequency of Supply Chain Disruptions. Journal of Operations Management, 36, 215–228 https://doi.org/10.1016/j.jom.2014.12.004