Jim wrote, >(this seems to involve interpersonal comparisons of utility.)
I don't think this need be the case. Let's say I value the move from A to B by -$1. Let's say you give me a $1. This dollar might sadden you but it makes me as likely to chose B as A (if B comes along with $1). I am indifferent now between A and (B+$1). But we don't need to know anything about how you "value" $1. For instance with a $1 maybe I can buy coffee but with one less dollar you now can't cover that small hole in the wall of your office (which a dollar bill was really well suited for). A dollar might represent very different things to the two of us. Eric .
