 Some commentators have made much of the difference between Sidgwick and Moore on the notion of ultimate good, urging that whereas Sidgwick prioritizes an unanalysable notion of “right,” Moore prioritizes an unanalysable notion of “good,” while adding a suspect ontological claim about “goodness” involving a non-natural property (Moore 1903; and Shaver 2000). However, Hurka (2003) has offered some forceful arguments against most such accounts: