This chapter may clarify the arguments of the preceding two; it will extend them a little. I will lode at what several philosophers have to say about first principles in ethics, concentrating on respects in which their arguments relate to mine. To relate them to each other, David Gauthier, John Rawls and Loren Lomasky develop arguments that are conventionalist—superordinate moral principles emerge with agreement among parties—and subjective—based on actor’s interests. Alan Gewirth’s is subjective and non-conventionalist (as is mine). Ayn Rand and Tibor Machan present objective arguments.