The general objection, it should be stressed, is not limited to Copp’s theory. The objection can be put equally forcefully for any of the other prominent theories of moral naturalism. Copp has a rebuttal, however, that would apply generally for the other naturalistic moral theories that entail an identity of the kind under attack. Consider a piece of paper that has the property of being a U.S. dollar bill. To state in the terms of economic theory the truth conditions for a piece of paper having