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  • 1.
    Lunander, Anders
    et al.
    Örebro University, Örebro University School of Business.
    Lundberg, Sofia
    Nationalekonomiska institutionen, Umeå universitet, Umeå, Sweden.
    Combinatorial Auctions in Public Procurement - Experiences from Sweden2012In: Journal of Public Procurement, ISSN 1535-0118, E-ISSN 2150-6930, Vol. 12, no 1, p. 81-109Article in journal (Refereed)
    Abstract [en]

    Combinatorial procurement auctions are increasingly being employed in the private and public sector as an alternative to simultaneous single contract auctions. This mechanism has the advantage that it enablessuppliers to express synergies across bundles of public contracts. This mitigates the exposure problem and also has the potential to both lower the price paid by the procuring authority and enhance efficiency. Thispaper provides stylized facts of recently performed combinatorial public procurements in various markets in Sweden.

  • 2.
    Lunander, Anders
    et al.
    Örebro University, Örebro University School of Business.
    Lundberg, Sofia
    Nationalekonomiska institutionen, Umeå universitet, Umeå, Sweden.
    Different design - different cost: an empirical analysis of combinatorial public procurement bidding of road maintenance2012In: Journal of Public Procurement, ISSN 1535-0118, E-ISSN 2150-6930, Vol. 12, no 3, p. 407-422Article in journal (Refereed)
    Abstract [en]

    This paper is an empirical analysis of firs-price sealed bid procurement auctions in Sweden, with and without combinatorial bidding. The data comprises procurement auctions of identical contracts (road resurfacing) with identical bidders under the same time period (2009-2011) in two different regions in Sweden. Given the comparison of the suppliers' offered price per tons of asphalt, we cannot reject the hypothesis of identical distribution of standalone bids generated in both types of auction. The distribution of package bids within the combinatorial format is significantly lower than the distribution of standalone bids within the non-combinatorial format, suggesting substantial cost reduction of allowing package bidding. Also, within the combinatorial format, our analysis od data indicates higher costs when packages are predetermined by the purchaser rather than chosen freely by the suppliers.

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