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Title: Matthew Chrisman
Ought and Must

Ethical theorists (normative ethicists, applied ethicists, metaethicists, and even deontic logicians) tend to assume that the word 'ought' indicates a moral obligation or duty of some sort or another. However, this practice is problematic for three related reasons. First, in many ordinary moral contexts, ‘ought’ is used to indicate something which is in some way favored by morality but which may still fall short of a duty or obligation. Second, ethical theory has all but ignored all of the non-moral uses of ‘ought’. Third, in all of its uses, ‘ought’ is intuitively weaker than correlative uses of ‘must’. There is almost no attempt at a systematic explanation of the semantic difference between 'ought' and 'must' in ethical theory.

Theoretical semanticists (such as Kratzer, von Fintel and Iatridou, Portner, and Hacquard) are, in my opinion, on the right track for explaining the semantic difference between these terms by classifying both of them as modal verbs and then seeking to explain all of their different “flavors” as contextually determined projections of some semantic core. However, when we bring these semantic ideas about modal auxiliaries into contact with the way 'ought' is used in ethical theory, I believe we continue to lack a compelling explanation of the general semantic distinction between ‘ought’ and ‘must’.

In this paper, a relatively simple account of the semantic difference between ‘ought’ and ‘must’ is floated. This account turns on the difference between recommendations and requirements; and it is interactive both with metaethical debate about the meaning of normative terms and the semantic debate about the representation of the content of modal auxiliaries.
When: Mon Mar 7 1pm – 2:30pm Eastern Time - Melbourne, Sydney
Where: University of Sydney philosophy common room
Calendar: Current Projects
Who:
    * [email protected] - creator

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