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.
