What health care providers are the major players in the U.S. health care system? What are the positive and negative effects of the often-conflicting self-interests and lack of regulation on these players?

Effects of the often-conflicting self-interests and lack of regulation

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What health care providers are the major players in the U.S. health care system? What are the positive and negative effects of the often-conflicting self-interests and lack of regulation on these players?