For monopoly
A) the four-firm concentration ratio is 100.
B) the Herfindahl-Hirschman Index is 10,000.
C) there is only one firm in the industry.
D) All of the above answers are correct.

Question

Quizplus · Accepted Answer

In a monopoly, there is only one firm in the industry, leading to a four-firm concentration ratio of 100 and a Herfindahl-Hirschman Index of 10,000, as both metrics indicate complete market control by a single firm.

For Monopoly