The word 'materialism' is ambiguous: it designates a moral doc- trine as well as a philosophy and, indeed, an entire world view. Moral materialism is identical with hedonism, or the doctrine that humans should pursue only their own pleasure. Philosophical ma- terialismis the view that the real worId is composed exclusively of material things. The two doctrines are logically independent: hedonism is consistent with immaterialism, and materialism is...