 More promising, however, is the thought that the suitable agents must be, in a strong sense, rational. Following Ramsey, various subjectivists have wanted to assimilate probability to logic by portraying probability as “the logic of partial belief” (1926; 1990, 53 and 55). A rational agent is required to be logically consistent, now taken in a broad sense. These subjectivists argue that this implies that the agent obeys the axioms of probability (although perhaps with only finite additivity), and that subjectivism is thus (to this extent) admissible. Before we can present this argument, we must say more about what degrees of belief are.