Suppose that three firms make up the entire wig manufacturing industry. one has a 40% market share, and the other two have a 30% market share each. the herfindahl index of this industry is . mane attraction, one of the firms with a 30% market share in the wig manufacturing industry, leaves the market. this would cause the herfindahl index for the industry to . the largest possible value of the herfindahl index is 10,000 because: an index of 10,000 corresponds to a monopoly firm with 100% market share an industry with an index higher than 10,000 is automatically regulated by the justice department an index of 10,000 corresponds to 100 firms with a 1% market share each