(偷懒直接从wiki粘贴了
In short, the theorem states that no rank-order electoral system can be designed that always satisfies these three “fairness” criteria:
- If every voter prefers alternative X over alternative Y, then the group prefers X over Y.
- If every voter’s preference between X and Y remains unchanged, then the group’s preference between X and Y will also remain unchanged (even if voters’ preferences between other pairs like X and Z, Y and Z, or Z and W change).
- There is no “dictator”: no single voter possesses the power to always determine the group’s preference.
arrow’s impossibility似乎足以说明民主系统下的投票结果并不能够真正反应出民众的偏好,直接对“common will”的存在提出质疑了。
读到有哲学家对此的回应是,民主投票的程序能够做到“regularly remove offensive politicians” 就够了,觉得不是很能接受… 如果接受AIT的话是不是就只能转向deliberative democracy呢?
不知道论坛上有没有人小伙伴看过这方面的内容233