In the Japanese construction sector where the bidding system has been recently reformed, the data of the tender results in areas of public construction works and/or consultancy services are now being made open, enabling objective analysis of such data from various viewpoints. In this research, such open data of a nation-wide coverage in the last two years or so has been collected comprehensively for academic analysis by some statistical methods. Also, public investments are seen to be decreasing sharply and the jurisdictional control to bid-rigging practices is being strengthened. The analysis of these data clarifies the tendency that severe competition among the bidders taking place and bidders resorting to price-dumping practices, which is becoming remarkable among the concerned part of the industry. The authors objectively describe the competitive situation in tenders and the characteristics of related corporate behaviors, as observed through this data analysis.
