Doesn’t irreversibility imply that there is zero probability of a trade opportunity to reverse the thing? I’m not proposing a new trait that your original scenario didn’t have; I’m proposing that I identified which aspect of your scenario was load-bearing.
I don’t think I understand how your new hypothetical is meant to be related to anything discussed so far. As described, the group doesn’t have strongly incomplete preferences, just 2 mutually-exclusive objectives.
Zero probability of trade is indeed the feature which would make the argument in the OP potentially not go through, when irreversibility is present. (Though we would still get a weakened form of the argument from the OP, in which we complete the preferences by adding a preference for a trade which has zero probability, and the original system is indifferent between that completion and its original preferences.)
Doesn’t irreversibility imply that there is zero probability of a trade opportunity to reverse the thing? I’m not proposing a new trait that your original scenario didn’t have; I’m proposing that I identified which aspect of your scenario was load-bearing.
I don’t think I understand how your new hypothetical is meant to be related to anything discussed so far. As described, the group doesn’t have strongly incomplete preferences, just 2 mutually-exclusive objectives.
Zero probability of trade is indeed the feature which would make the argument in the OP potentially not go through, when irreversibility is present. (Though we would still get a weakened form of the argument from the OP, in which we complete the preferences by adding a preference for a trade which has zero probability, and the original system is indifferent between that completion and its original preferences.)