The AMA analyzed market concentration in all 384 metropolitan statistical areas, the 50 states, and Washington, D.C., using the Herfindahl-Hirschman Index. Federal guidelines classify markets with an HHI of more than 2,500 points as “highly concentrated.”
Ten states with the least competitive commercial health insurance markets:
1. Alabama
2. Hawaii
3. Michigan
4. Delaware
5. South Carolina
6. Kentucky
7. Alaska
8. Louisiana
9. Illinois
10. North Carolina
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