There are person-affecting views that will rank X<Y or otherwise not choose X over Y even if the average welfare of the individuals common to both X and Y is higher in X.
A necessitarian view might just look at all the people common to all available options at once, maximize their average welfare, and then ignore contingent people (or use them to break ties, say). Many individuals common to two options X and Y could be ignored this way, because they aren’t common to all available options, and so are still contingent.
Christopher J. G. Meacham, 2012 (EA Forum discussion here) describes another transitive person-affecting view, where I think something like “the available alternatives are so relevant, that they can even overwhelm one world being better on average than another for every person the two have in common”, which you mentioned in your reply, is basically true. For each option, and each individual in the the option, we take the difference between their maximum welfare across options and their welfare in that option, add up them up, and then minimize the sum. Crucially, it’s assumed when someone doesn’t exist in an option, we don’t add their welfare loss from their maximum for that option, and when someone has a negative welfare in an option but don’t exist in another option, their maximum welfare across options will at least be 0. There are some technical details for matching individuals with different identities across worlds when there are people who aren’t common to all options. So, in the repugnant conclusion, introducing B makes A>A+, because it raises the maximum welfares of the extra people in A+.
Some views may start from pairwise comparisons that would give the kinds of cycles you described, but then apply a voting method like beatpath voting to rerank or select options and avoid cycles within option sets. This is done in Teruji Thomas, 2019. I personally find this sort of approach most promising.
This is interesting, I’m especially interested in the idea of applying voting methods to ranking dilemmas like this, which I’m noticing is getting more common. On the other hand it sounds to me like person-affecting views mostly solve transitivity problems by functionally becoming less person-affecting in a strong, principled sense, except in toy cases. Meacham sounds like it converges to averagism on steroids from your description as you test it against a larger and more open range of possibilities (worse off people loses a world points, but so does more people, since it sums the differences up). If you modify it to look at the average of these differences, then the theory seems like it becomes vulnerable to the repugnant conclusion again, as the quantity of added people who are better off in one step in the argument than the last can wash out the larger per-individual difference for those who existed since earlier steps. Meanwhile the necessitarian view as you describe it seems to yield either no results in practice if taken as described in a large set of worlds with no one common to every world, or if reinterpreted to only include the people common to the very most worlds, sort of gives you a utility monster situation in which a single person, or some small range of possible people, determine almost all of the value across all different worlds. All of this does avoid intransitivity though as you say.
There are person-affecting views that will rank X<Y or otherwise not choose X over Y even if the average welfare of the individuals common to both X and Y is higher in X.
A necessitarian view might just look at all the people common to all available options at once, maximize their average welfare, and then ignore contingent people (or use them to break ties, say). Many individuals common to two options X and Y could be ignored this way, because they aren’t common to all available options, and so are still contingent.
Christopher J. G. Meacham, 2012 (EA Forum discussion here) describes another transitive person-affecting view, where I think something like “the available alternatives are so relevant, that they can even overwhelm one world being better on average than another for every person the two have in common”, which you mentioned in your reply, is basically true. For each option, and each individual in the the option, we take the difference between their maximum welfare across options and their welfare in that option, add up them up, and then minimize the sum. Crucially, it’s assumed when someone doesn’t exist in an option, we don’t add their welfare loss from their maximum for that option, and when someone has a negative welfare in an option but don’t exist in another option, their maximum welfare across options will at least be 0. There are some technical details for matching individuals with different identities across worlds when there are people who aren’t common to all options. So, in the repugnant conclusion, introducing B makes A>A+, because it raises the maximum welfares of the extra people in A+.
Some views may start from pairwise comparisons that would give the kinds of cycles you described, but then apply a voting method like beatpath voting to rerank or select options and avoid cycles within option sets. This is done in Teruji Thomas, 2019. I personally find this sort of approach most promising.
This is interesting, I’m especially interested in the idea of applying voting methods to ranking dilemmas like this, which I’m noticing is getting more common. On the other hand it sounds to me like person-affecting views mostly solve transitivity problems by functionally becoming less person-affecting in a strong, principled sense, except in toy cases. Meacham sounds like it converges to averagism on steroids from your description as you test it against a larger and more open range of possibilities (worse off people loses a world points, but so does more people, since it sums the differences up). If you modify it to look at the average of these differences, then the theory seems like it becomes vulnerable to the repugnant conclusion again, as the quantity of added people who are better off in one step in the argument than the last can wash out the larger per-individual difference for those who existed since earlier steps. Meanwhile the necessitarian view as you describe it seems to yield either no results in practice if taken as described in a large set of worlds with no one common to every world, or if reinterpreted to only include the people common to the very most worlds, sort of gives you a utility monster situation in which a single person, or some small range of possible people, determine almost all of the value across all different worlds. All of this does avoid intransitivity though as you say.