 We can understand the relation to subjective probability theory in the following way. Subjective probabilities require the ideal doxastic agent to divide her knowledge base into two mutually exclusive and jointly exhaustive parts: one that speaks in favor of \(A\), and one that speaks against \(A\). That is, the neutral part has to be distributed among the positive and negative parts. Subjective probabilities can thus be seen as DS belief functions without ignorance. (See Pryor (2007, Other Internet Resources) for a model of doxastic states that includes probability theory and Dempster-Shafer theory as special cases.)