Well, your prior gives you a unique value,
So the claim is that you have arbitrary precision priors. What are they, and where are they stored?
Sorry, I haven't been very clear. A perfect bayesian agent would have a unique real number to represent it's level of belief in every hypothesis.
The betting-offer system I described about can force people (and force any hypothetical agent) to assign unique values.
Of course, an actual person won't be capable of this level of precision or coherence.
http://vimeo.com/22099396
What do people think of this, from a Bayesian perspective?
It is a talk given to the Oxford Transhumanists. Their previous speaker was Eliezer Yudkowsky. Audio version and past talks here: http://groupspaces.com/oxfordtranshumanists/pages/past-talks