著者

遠藤 和義 岩松 準

出版者

一般社団法人日本建築学会

雑誌

建築雑誌 (ISSN:00038555)

巻号頁・発行日

vol.124, no.1597, pp.10-16, 2009-12-20

被引用文献数

1

著者

岩松 準 遠藤 和義

出版者

日本建築学会

雑誌

日本建築学会計画系論文集 (ISSN:13404210)

巻号頁・発行日

vol.88, no.803, pp.237-245, 2023-01-01 (Released:2023-01-01)

参考文献数

11

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In the many construction marketplaces in Japan, number of participants per bid has gradually decreased over the long term. Especially in the Tokyo metropolitan area, the number of single-bids has gradually increased. And that exposed some competition policy issues. The Tokyo Metropolitan Government had tried to cancel some single-bids in one-year period start from June 2017, but it had been abandoned due to the industry’s opposition and interference of public works projects by that measure etc. Large number of bid result data for building works over 20 years mainly for public building works in the Kanto region were analyzed.

著者

岩松 準 遠藤 和義

出版者

一般社団法人日本建築学会

雑誌

日本建築学会計画系論文集 (ISSN:13404210)

巻号頁・発行日

vol.73, no.630, pp.1767-1773, 2008-08-30

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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.