Stephan M. Wagner

Negative Default Dependencies in Supplier Networks

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Paper

Negative default dependence in supplier networks
Year: 
2011

If people talk about disruptions and network effects within the supply chain, the associations are most often negative.

The picture of an automotive/just-in-time supply chain comes to mind, where a small screw from a distant supplier did not get delivered in time and all production processes within the whole network suddenly come to an involuntary halt.

But on the other hand there are companies profiting from these smaller and larger disruptions: competition.

An Empirical Investigation into Supply Chain Vulnerability

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Paper

An Empirical Investigation into Supply Chain Vulnerability Experienced by German Firms
Year: 
2006

One basic assumption in risk-aware supply chain design is the notion that the design of the supply chain actually has an impact on the vulnerability of the supply chain.
This question has been analyzed about six years ago in a broad empirical study by Wagner and Bode.

h5. Method

The authors use a rather large sample of companies in Germany. Overall nearly 5000 supply chain professionals were asked to participate and 760 actually took part in the study.

Modeling Defaults of Companies in Multi-Stage SC Networks

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Paper

Modeling defaults of companies in multi-stage supply chain networks
Year: 
2012

Agent-based supply chain models are build using small entities (agents), which might represent a single company.
Each of the agents has its own goals and rules of operation programmed into a computer. The interaction between several agents of this kind leads to a more realistic and complex behavior of the system.

Assessing Vulnerability of a Supply Chain

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Paper

Assessing the vulnerability of supply chains using graph theory
Year: 
2010

At this year’s HICL conference in Hamburg, I was able to present some of my own research. In the follow-up discussions several points were highlighted, especially focussing on the viability of supply chain wide cooperation and collaboration efforts and on the difficulties of doing a realistic quantification of supply chain risks.

Impact of Risks on Supply Chain Performance

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Paper

An empirical Examination of Supply Chain Performance along Several Dimensions of Risk
Year: 
2008

I am often astounded by the fact how many great articles I haven’t read yet. A good scientific paper contains an comprehensive description of the methodologies used, a theoretical foundation and literature review from which hypothesis are drawn, which are then confirmed or rejected in the course of the paper. And of course, it is always a plus to actually find some results in the course of the analysis.

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