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Detection and prevention of unbalanced bids

Author

Listed:
  • David Arditi
  • Ranon Chotibhongs

Abstract

Unbalanced bidding is a serious problem for the construction owner because it may increase the cost of construction The most common way to mathematically unbalance a bid is frontloading where a bidder overstates the unit price of line items scheduled to be performed early in the project and understates the unit price of line items performed later. A bidder can also overstate the unit price of a line item whose quantity was somehow underrated by the engineer. If the owner proves that a mathematically unbalanced bid costs more to perform, the bid is said to be materially unbalanced, in which case the owner can reject the bid. A model is presented that formalizes and automates the process of detecting mathematically and materially unbalanced bids by comparing line item prices with the engineer's estimates and the average prices offered by the bidders. This model allows owners to detect and reject unbalanced bids, and deters bidders from unbalancing their bid.

Suggested Citation

  • David Arditi & Ranon Chotibhongs, 2009. "Detection and prevention of unbalanced bids," Construction Management and Economics, Taylor & Francis Journals, vol. 27(8), pages 721-732.
    • Handle: RePEc:taf:conmgt:v:27:y:2009:i:8:p:721-732
    DOI: 10.1080/01446190903117785
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    Citations

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    Cited by:

    1. Svante Mandell & Johan Nyström, 2013. "Too Much Balance in Unbalanced Bidding," Studies in Microeconomics, , vol. 1(1), pages 23-35, June.
    2. Yi Su & Gunnar Lucko, 2015. "Synthetic cash flow model with singularity functions for unbalanced bidding scenarios," Construction Management and Economics, Taylor & Francis Journals, vol. 33(1), pages 35-54, January.
    3. João Adelino Ribeiro & Paulo Jorge Pereira & Elísio Brandão, 2013. "Volume Uncertainty in Construction Projects: a Real Options Approach," CEF.UP Working Papers 1309, Universidade do Porto, Faculdade de Economia do Porto.
    4. Nyström, Johan & Wikström, Daniel, 2019. "Empirical analysis of unbalanced bidding on Swedish roads," Working Papers 2019:4, Swedish National Road & Transport Research Institute (VTI).
    5. Polat Gul & Turkoglu Harun & Damci Atilla & Akin Firat Dogu, 2020. "Detecting unbalanced bids via an improved grading-based model," Organization, Technology and Management in Construction, Sciendo, vol. 12(1), pages 2072-2082, January.
    6. Mandell, Svante & Nyström, Johan, 2011. "Why are bids not more unbalanced?," Working papers in Transport Economics 2011:13, CTS - Centre for Transport Studies Stockholm (KTH and VTI).

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