Bandwagon Effect

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The bandwagon effect is a psychological phenomenon in which people do something primarily because other people are doing it, regardless of their own beliefs, which they may ignore or override. This tendency of people to align their beliefs and behaviors with those of a group is also called a herd mentality. The term “bandwagon effect” originates from politics but has wide implications commonly seen in consumer behavior and investment activities. This phenomenon can be seen during bull markets and the growth of asset bubbles.

From Investopedia.