Table 2. Number of successful bids by...

Table 2.

Number of successful bids by contractor for paving works commissioned by Ehime Prefecture

Market condition		Competitive (low HHI)		Nearly monopoly		Oligopolistic	Monopoly			Total successful bids (by contractor)
Headquarters location of contractor		Matsuyama city	Imabari city	Uwajima city	Yawatahana city	Uchiko town	Ikata town	Matsuno town	Ainan town
Matsuyama city	M-1		16							16
	M-2	62		2	23	54	65		80	564
	M-3		12							15
	M-4	4								4
	M-5	48	1							50
	M-6	77								77
	M-7	19								27
	M-8	10								19
	M-9	72		2						406
Imabari city	I-1		89							92
	I-2		93							96
	I-3		78							97
Uwajima city	Uw-1			154				30		250
Yawatahama city	Y-1				63					98
Uchiko town	Uc-1					41				80
Ozu city	O-1					23				113
Ozu city	O-2					16				94
Saijo city	Sa-1									6
	Sa-2									9
	Sa-3									40
	Sa-4		4							118
Niihama city	N - 1									8
	N - 2									8
	N - 3									10
	N - 4									47
Shikoku-chuo city	Sk-1									108
Shikoku-chuo city	Sk-2									40
Toon city	To-1	1								13
Takamatsu city	Ta-1									29
Total (by municipality)		293	293	158	86	134	65	30	80	2,535
Average bidders per bid		5.222	5.457	5.430	4.570	5.231	5.000	5.500	5.263
Average withdrawals per bid		0.075	0.061	0.082	0.058	0.015	0.108	0.033	0.038
Average winning bid ratio		0.889	0.925	0.946	0.943	0.934	0.929	0.943	0.938
HHI (calculated over 8 years)		0.244	0.269	0.947	0.565	0.347	1	1	1
Percentage of designated biddings		0.51	0.61	0.70	0.53	0.73	0.55	0.80	0.78

Market condition		Competitive (low HHI)		Nearly monopoly		Oligopolistic	Monopoly			Total successful bids (by contractor)
Headquarters location of contractor		Matsuyama city	Imabari city	Uwajima city	Yawatahana city	Uchiko town	Ikata town	Matsuno town	Ainan town
Matsuyama city	M-1		16							16
	M-2	62		2	23	54	65		80	564
	M-3		12							15
	M-4	4								4
	M-5	48	1							50
	M-6	77								77
	M-7	19								27
	M-8	10								19
	M-9	72		2						406
Imabari city	I-1		89							92
	I-2		93							96
	I-3		78							97
Uwajima city	Uw-1			154				30		250
Yawatahama city	Y-1				63					98
Uchiko town	Uc-1					41				80
Ozu city	O-1					23				113
Ozu city	O-2					16				94
Saijo city	Sa-1									6
	Sa-2									9
	Sa-3									40
	Sa-4		4							118
Niihama city	N - 1									8
	N - 2									8
	N - 3									10
	N - 4									47
Shikoku-chuo city	Sk-1									108
Shikoku-chuo city	Sk-2									40
Toon city	To-1	1								13
Takamatsu city	Ta-1									29
Total (by municipality)		293	293	158	86	134	65	30	80	2,535
Average bidders per bid		5.222	5.457	5.430	4.570	5.231	5.000	5.500	5.263
Average withdrawals per bid		0.075	0.061	0.082	0.058	0.015	0.108	0.033	0.038
Average winning bid ratio		0.889	0.925	0.946	0.943	0.934	0.929	0.943	0.938
HHI (calculated over 8 years)		0.244	0.269	0.947	0.565	0.347	1	1	1
Percentage of designated biddings		0.51	0.61	0.70	0.53	0.73	0.55	0.80	0.78

Note(s):

This table lists all contractors with winning bids for paving works awarded by Ehime Prefecture during the data period, including those with unsuccessful bids in the eight selected municipalities (indicated in gray). The number in each cell represents the number of successful bids and totals 2,535, excluding 1 with an unspecified construction site – the last 6 lines at the bottom show statistical summaries

Source(s): Author’s own work, using official bid data disclosed by Ehime Prefecture

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