Anomalies: Preference Reversals
过去二十年大量研究证实了偏好反转现象，即不同偏好诱导方法可能导致不同的属性权重和排序，挑战了决策者具有固定偏好顺序的传统假设。
The preference reversal phenomenon has been established in numerous studies during the last two decades, but its causes have only recently been uncovered. This phenomenon, or cluster of phenomena, challenges the traditional assumption that the decisionmaker has a fixed preference order that is captured accurately by any reliable elicitation procedure. If option A is priced higher than option B, we cannot always assume that A is preferred to B in a direct comparison. The evidence shows that different methods of elicitation could change the relative weighting of the attributes and give rise to different orderings.