If the four-firm concentration ratio in an oligopolistic industry is 100 percent and each firm has an equal percentage of sales, the Herfindahl index is

A) 10,000.
B) 2,500.
C) 3,750.
D) 1,000.

Herfindahl Index

A measure of market concentration to assess the competitive landscape, calculated by summing the squares of the market shares of all firms in the industry.

Concentration Ratio

A measure used to assess the degree of market concentration, quantifying the market share held by the largest firms within an industry.

Equal Percentage

A rate or proportion where the same fraction or share applies uniformly across different scenarios or entities.