 To argue that a certain norm is not just correct but ought to be followed on pain of incoherence, Bayesians traditionally proceed by way of a Dutch Book argument (as presented in the tutorial  section 1.6).  For the susceptibility to a Dutch Book is traditionally taken by Bayesians to imply one’s personal incoherence. So, as you will see below, the norms discussed in this section have all been defended with one or another type of Dutch Book argument, although it is debatable whether some types are more plausible than others.