In the third and subsequent editions of Principles of Biomedical Ethics, Tom Beauchamp and James Childress articulate a series of ethical norms that they regard as “derived” from, and hence carrying, the “authority” of the common morality. Although Beauchamp and Childress do not claim that biomedical norms they derive from the common morality automatically become constituents of the common morality, or that every detail of their account carries the authority of the common morality, they regard these derived norms as provisionally (...) binding in a way that does not apply to the norms of mere “particular” moralities. Whereas particular moralities “do not bind other persons or communities,” Beauchamp and Childress have designed the norms of Principles of Biomedical Ethics to be “extensions” of the common morality that universally binds other persons and communities. Beauchamp and Childress seem to hold that (1) the norms they articulate in Principles of Biomedical Ethics are derived in an objective way from the common morality, and also that by virtue of being so derived (2) they carry a moral authority that objectively exceeds the authority of norms constituting particular moralities. My thesis in this essay is that both of these claims are false. (shrink)