Abstract

Davis Lewis describes that decision theory is no more than a systematic account of an ordinary, common sense philosophy of mind. It is a tool applied to the task of coming to know ourselves and others as persons. The aim is to extend the value function from individual words to propositions so that it gives a measure of degrees of desire. Decision theorists agree that desirability is to be explicated as expected value. They agree that insofar as decision theory is a normative enterprise, it prescribes that one choose so as to maximize expected value. They agree that the notion of expected value involves the notion of revision of degrees of belief. Desire‐as‐belief implies near‐opinionation or indifference. The author thinks that there is no small irony in the fact that the greatest contemporary defender of Humeanism is also one of the co‐founders of the only version of decision theory.