Bandwagon effect
Phenomenon whereby the rate of uptake of beliefs, ideas, fads and trends increases the more that they have already been adopted by others
The bandwagon effect is the tendency for people to adopt certain behaviors, styles, or attitudes simply because others are doing so. More specifically, it is a cognitive bias by which public opinion or behaviours can alter due to particular actions and beliefs rallying amongst the public. It is a psychological phenomenon whereby the rate of uptake of beliefs, ideas, fads and trends increases with ... Wikipedia