Table S1.

Results of linear or quadratic regressions of CV of annual revenue as a function of HHI

Fishery	Constant	HHI	HHI^2	R-square	Mean HHI
Alaska halibut and sablefish	−1.29E-01**	2.08E-04***	−1.26E-08***	0.12	6,777
Alaska AFA pollock	3.82E-02	1.26E-04***	−1.00E-08***	0.06	6,773
Alaska BSAI crab	3.51E-01***	3.11E-05***	n.a.	0.05	5,838
Alaska BSAI nonpollock (Amendment 80)	2.68E-01*	3.57E-05	n.a.	0.04	4,603
Central Gulf of Alaska rockfish	2.73E-01***	3.47E-05**	n.a.	0.08	3,990
Pacific groundfish trawl	9.78E-02**	6.89E-05***	n.a.	0.19	5,479
Pacific at-sea whiting	−1.82E-01	2.14E-04***	−1.47E-08**	0.24	5,037
Pacific shoreside whiting	1.46E-01***	5.71E-05***	n.a.	0.14	5,037
Pacific fixed gear sablefish	−1.56E-01	1.73E-04***	−8.52E-09*	0.28	6,029
Northeast groundfish	1.94E-01***	4.59E-05***	n.a.	0.10	6,841
Northeast general category scallop	2.36E-01***	3.84E-05***	n.a.	0.08	7,335
Mid-Atlantic tilefish	−3.84E-01	2.76E-04**	−2.09E-08**	0.33	7,701
Gulf of Mexico red snapper	3.14E-01***	1.12E-04***	−8.49E-09***	0.01	5,563
Gulf of Mexico grouper and tilefish	6.15E-03	2.05E-04***	−1.33E-08***	0.02	7,221

n.a., not applicable.