Designing a multi-attribute auction has many advantages in respect to attributes besides price. Nevertheless, the complexity of this method makes it hard to carry out the optimal mechanism. This paper combines the first-sealed auction mechanism with multi-attribute auction, and gives a method of transforming multi-attribute auction into single-attribute auction on margin bid. The analysis indicates that this method can just not only reduce the transaction risk caused by suppliers who will abandon the bid, but also makes the multi-attribute auction more easier to implement and operate; Besides, the method meets the incentive compatibility and participation constraint conditions under which the highest bidding supplier will win the auction.
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