Kathy Laskey
Kathy
The pertinent result here is a 1954 theorem by
Blackwell and Girschick (?), saying:
Information source A is consistently more valuable
than B, across all utilities and prior probabilisties,
if and only if B is a stochastic mixture of A.
(i.e., there is a stochastic matrix M, such that B = MA)
=======Judea