This document discusses four main theories related to health care: egalitarian theories, utilitarian theories, libertarian theories, and theories of justice. Egalitarian theories emphasize equal access to goods and services and providing universal health care. Utilitarian theories focus on maximizing public utility through political intervention and wealth redistribution. Libertarian theories emphasize personal rights to liberty. The document also discusses Daniel Callahan's natural life span argument and principles for limiting medical care after a natural life span.