So a precise probabilist cannot satisfy these reasonable desiderata of suspension of judgement. An imprecise probabilist can: for example, the set of all probability functions over \(X\) satisfies both desiderata. There may be more informative priors that also represent suspension of judgement, but it suffices for now to point out that IP seems better able to represent suspension of judgement than precise probabilism. Section 5.5 of Walley (1991), discusses IP’s prospects as a method for dealing with suspension of judgement.