PeterisP comments on Pinpointing Utility - Less Wrong

57 [deleted] 01 February 2013 03:58AM

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Comment author: [deleted] 29 January 2013 03:32:40PM 3 points [-]

Thanks for correcting me! I changed that paragraph. Is it less offensive to people who know what they are talking about now?

Sometimes people refer to this relativity of utilities as "positive affine structure" or "invariant up to a scale and shift", which confuses me by making me think of a utility function as a set of things with numbers coming out, which don't agree on the actual numbers, but can be made to agree with a linear transform, rather than a space I can measure distances in.

Comment author: PeterisP 01 February 2013 09:45:42AM 0 points [-]

I feel confused. "a space I can measure distances in" is a strong property of a value, and it does not follow from your initial 5 axioms, and seems contrary to the 5th axiom.

In fact, your own examples given further seem to provide a counterexample - i.e., if someone prefers being a whale to 400 actual orgasms, but prefers 1/400 of being a whale to 1 orgasm, then both "being a whale" and "orgasm" have some utility value, but they cannot be used as units to measure distance.

If you're in a reality where a>b and 2a<2b, then you're not allowed to use classic arithmetic simply because some of your items look like numbers, since they don't behave like numbers.

Comment author: nshepperd 01 February 2013 11:11:50AM 3 points [-]

"Hawaii" can't be used as a unit to measure distance, nor can "the equator", but "the distance from Hawaii to the equator" can. Similarly, "the difference between 0 orgasms and 1 orgasm" can be used as a unit to measure utilities (you could call this unit "1 orgasm", but that would be confusing and silly if you had nonlinear utility in orgasms: 501 orgasms could be less than or more than "1 orgasm" better than 500).

Also, did you mean to have these the other way around?:

but prefers 1/400 of being a whale to 1 orgasm