 There have been a number of arguments advanced in support of the two core Bayesian norms. Perhaps the most influential is of the kind called Dutch Book arguments. Dutch Book arguments are motivated by a simple, intuitive idea: Belief guides action. So, the more strongly you believe that it will rain tomorrow, the more inclined you are, or ought to be, to bet on bad weather. This idea, which connects degrees of belief to betting dispositions, can be captured at least partially by the following: