 As a moral realist, Price rejects all forms of voluntarism, all forms of the self-interest theory, as well as all forms of the sentimentalist theories of Hutcheson and Hume. A central plank in his arguments against the first two of these positions is what would later become known as the Open Question Argument. Indeed it is Price, and not Moore, that should be credited with its discovery. Price’s challenge, like Moore’s, poses a dilemma for his opponent. Either the opponent is offering an account of what constitutes rightness and wrongness, or she is offering an account of what makes actions right and wrong. Either answer leads to difficulties. Embracing the first horn leaves the proponent open to the Open Question Argument.