R. M. Hare - Universal Prescriptivism

Universal Prescriptivism

In a series of books, especially The Language of Morals, Freedom and Reason, and Moral Thinking, Hare gave shape to a theory that he called universal prescriptivism. According to this, moral terms such as 'good', 'ought' and 'right' have two logical or semantic properties: universalizability and prescriptivity. By the former, he meant that moral judgments must identify the situation they describe according to a finite set of universal terms, excluding proper names, but not definite descriptions. By the latter, he meant that moral agents must perform those acts they consider themselves to have an obligation to perform whenever they are physically and psychologically able to do so. In other words, he argued that it made no sense for someone to say, sincerely: "I ought to do X," and then fail to do X. This was identified as a major flaw in Hare's system, as it appeared to take no account of akrasia, or weakness of the will.

Hare argued that the combination of universalizability and prescriptivity leads to a certain form of consequentialism, namely, preference utilitarianism.