I forgot the other requirement, and the more onerous one, for Aumann agreement: the two people’s priors must already agree. This is absolutely unrealistic.
Strong Bayesians may say that there is a unique universal prior that every perfect Bayesian reasoner must have, but until that prior can be exhibited, Aumann agreement must remain a mirage. No-one has exhibited that prior.
I forgot the other requirement, and the more onerous one, for Aumann agreement: the two people’s priors must already agree. This is absolutely unrealistic.
Strong Bayesians may say that there is a unique universal prior that every perfect Bayesian reasoner must have, but until that prior can be exhibited, Aumann agreement must remain a mirage. No-one has exhibited that prior.