百度上的定义为:
攀比效应(Bandwagon Effect)较为典型的连带外部正效应,消费者的一种赶时髦的偏好,即想拥有一种其他消费者已拥有的商品。
wiki上的定义为:
The bandwagon effect is a phenomenon whereby the rate of uptake of beliefs, ideas, fads and trends increases the more that they have already been adopted by others. In other words, the bandwagon effect is characterized by the probability of individual adoption increasing with respect to the proportion who have already done so.
百度上的定义为:
虚荣效应(Snob Effect)较为典型连带外部负效应,消费者想拥有只有少数人才能享用的或独一无二的商品的偏好。
wiki上的定义为:
In microeconomics, the snob effect is a phenomenon referring to the situation where the demand for a certain good by individuals of a higher income level is inversely related to the demand for the good by individuals of a lower income level.
其成因必然是心理上的。而其对定价策略的影响可见Leibenstein, Harvey (1950) 的文章。