Weak congestion in output additive data envelopment analysis

Quanling Wei, Hong Yan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

20 Citations (Scopus)


Our earlier work [Wei QL, Yan H. Congestion and returns to scale in data envelopment analysis. European Journal of Operational Research 2004;153:641-60] discussed necessary and sufficient conditions for the existence of congestion together with aspects of returns to scale under an output-oriented DEA framework. In line with this work, the current paper investigates the issue of "weak congestion", wherein congestion occurs when the reduction of selected inputs causes some, rather than all, outputs to increase, without a worsening of others. We define output efficiency for decision making units under a series of typical DEA output additive models. Based on this definition, we offer necessary and sufficient conditions for the existence of weak congestion. Numerical examples are provided for purposes of illustration.
Original languageEnglish
Pages (from-to)40-54
Number of pages15
JournalSocio-Economic Planning Sciences
Issue number1
Publication statusPublished - 1 Mar 2009


  • Congestion
  • Data envelopment analysis
  • Efficiency

ASJC Scopus subject areas

  • Geography, Planning and Development
  • Economics and Econometrics
  • Statistics, Probability and Uncertainty
  • Strategy and Management
  • Management Science and Operations Research


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