Abstract

This paper takes some first steps in a study of the thesis that “ought” implies “can.” Considerable attention is given to the proper interpretation of the thesis, including the interpretation of “ought,” the interpretation of “can,” and the interpretation of “implies.” Having chosen a particular interpretation of the thesis to work on—in some ways its broadest interpretation—the paper tries to bring out some considerations that bear on its truth or falsity. After an excursion into the general theory of value, this paper finds it false. The paper concludes with the suggestion that part of its allure comes of confusion with another thesis, namely the thesis that “ought to try” implies “can succeed.” Suitably qualified, this last thesis is true, and the false thesis that “ought” implies “can” basks in the reflected glory. Left for another day are narrower interpretations of “ought” implies “can” which may protect it against my objections