 One important difference between Jeffrey’s desirability formula and Savage’s expected utility formula, is that there is no distinction made between desirability and “expected” desirability, unlike what has to be done in Savage’s theory, where there is a clear distinction between utility, measuring an agent’s fundamental desires for ultimate outcomes, and expected utility, measuring an agent’s preferences over uncertain prospects or acts. This disanalogy is due to the fact that there is no sense in which the \(p_i\)s that \(p\) is evaluated in terms of need to be ultimate outcomes; they can themselves be thought of as uncertain prospects that are evaluated in terms of their different possible realisations.