Abstract
Various numbers of bidders exists in public building and/or construction works. Practically in Japan, exceedingly 10 bidders are participating in one bid. It is conceivable that number of bidders in one bid affects certain amount of influence on the competition. With using Friedman's model or Gates' model, which are known as maximum expected value models, the more the numbers of bidders increase, the more it becomes competitive, and the bidders have motive to present lower prices. Authors have tried to confirm the fact statistically with using recently released bidding results data of MLIT (the Ministry of Land, Infrastructure and Transport). In many cases, the ratios of bid price against ceiling price which are estimated by owner side engineers are confirmed decreasing as the number of bidders increases.
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