If model A is substantially simpler than model B, its contribution to the expected utility calculation dominates model B’s. Of course you won’t concentrate all the mass on one model, but it is quite common to concentrate the mass on a class of nearly equivalent models.
I was giving an intuitive explanation, which seems to map pretty clearly onto the formal definition. I can be more explicit if you want, but I suspect you don’t actually find it unrecognizable.
If model A is substantially simpler than model B, its contribution to the expected utility calculation dominates model B’s. Of course you won’t concentrate all the mass on one model, but it is quite common to concentrate the mass on a class of nearly equivalent models.
I was giving an intuitive explanation, which seems to map pretty clearly onto the formal definition. I can be more explicit if you want, but I suspect you don’t actually find it unrecognizable.