Figure 3.2 contains data on the number of people that enrolled in Medicare Part D, which is a supplemental insurance policy offered to individuals on Medicare. Assuming that this chart contains all of the competitors in this industry (you need this assumption or you won't know the size of the total industry), calculate the CR4, CR8, and HHI. In addition, describe in a sentence or two what industry type you would categorize the Medicare Part D industry.

Total Medicare Part D enrollment by company:

CVS: 6.11 million

United Health Group: 5.36 million

Humana: 4.90 million

Express Scripts: 2.51 million

Aetna: 2.21 million

Blue Cross Blue Shield Plans: 1.26 million (not-for-profit plans, note: membership as of July 6,

2018)

WellCare Health Plans: 1.07 million

Cigna: 0.77 million

Rite Aid: 0.56 million

Anthem: 0.28 million

All others: 0.49 million

Drug Plans CVS and Aetna both sell Medicare drug plans, and they will have to divest some business to win antitrust approval CVS United Health Group Humana Express Scripts Aetna Blue Cross Blue Shield Plans WellCare Health Plans Cigna Rite Aid Anthem All Others 1 M 7M 2M 4M 5M 6M Total Medicare Part D Enrollment Powered by Highcharts Cloud Company