The Herfindahl-Hirschman Index Is Calculated as

The Herfindahl-Hirschman Index is calculated as

A) the cube of the percentage market share of each firm summed over the largest 100 firms.
B) the square of the percentage market share of each firm summed over the largest 50 firms or summed over all the firms if there are fewer than 50.
C) the square of the percentage market share of each firm summed over the largest 20 firms.
D) double the market share of the five largest firms.
E) none of the above