DeAngelo et al. (2006) have recently used the AWS criterion in a M/G/1 queuing model to show that there is no necessary tension between economic cost minimization and inspection stringency in non-native species management. In this paper, we use an alternate cost criterion (AWQ criterion) to investigate the generality of this central result in DeAngelo et al. (2006). Our theoretical analysis shows that there is no unambiguous answer to this question. Therefore, we use numerical methods and our numerical analysis leads to two findings. First, for many values of the model parameters that describe the strictness of inspections, there is a tension between cost minimization and inspection stringency. Second, for most values of the model parameter that depicts the volume of maritime trade handled by the seaport under consideration, there is no tension between cost minimization and inspection stringency.

Publication Date



This is a post-print of an article published by Springer. Copyright 2007 Springer International Publishing AG. The final publication is available at link.springer.com via https://doi.org/10.1007/s00168-007-0121-y

We thank the editor Tschangho John Kim, two anonymous referees, and session participants at the 2005 NARSC meeting in Las Vegas for their helpful comments on a previous version of this paper. In addition, Batabyal acknowledges financial support from the USDA’s PREISM program by means of Cooperative Agreement 43-3AEM-4-80100 and from the Gosnell endowment at RIT. The usual disclaimer applies.

Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works in February 2014.

Document Type


Department, Program, or Center

School of Mathematical Sciences (COS)


RIT – Main Campus