Columbia subject headings:
Competition--United States.
Health insurance--United States--Cost control.
Medical care--United States--Cost control.
Harvard subject headings:
Competition--United States
Health insurance--United States--Cost control
Medical care, Cost of--United States
Medical care--United States--Cost control
Princeton subject headings:
Competition--United States.
Health insurance--United States--Cost control.
Medical care--United States--Cost control.