To say that an action is pareto superior is to say only that at least one person is higher along his or hers preferenceranking, while no one else is any worse off with respect to his or hers.
我们说一个行为是帕累托更优的意思也就是没有人的境况比其偏好的更差，但至少有一个人的偏好得到了满足。
2
In the process of preference aggregation, the ranking index value given by individuals and the incomplete information of decision makers' importance are also considered.