Bandwagon Effect

The bandwagon effect is the observation that people often do (or believe) things because many other people do (or believe) the same. The effect is often pejoratively referred to as herding instinct, particularly as applied to adolescents. Without examining the merits of the particular thing, people tend to “follow the crowd”. The bandwagon effect is the reason for the bandwagon fallacy's success.
See more at Wikipedia.org...

Noun
1. the phenomenon of a popular trend attracting even greater popularity; "in periods of high merger activity there is a bandwagon effect with more and more firms seeking to engage in takeover activity"; "polls are accused of creating a bandwagon effect to benefit their candidate"
(hypernym) consequence, effect, outcome, result, event, issue, upshot

as some individuals or groups demand an asset or product others react, imitate and also demand e.g. the buying of dot.com shares.

Bandwagon effect
(Econ) Hiệu ứng đoàn tàu+ Hiệu ứng nhờ đó khi giá cả hàng hoá giảm và cầu của một vài bộ phận hay các cá nhân trong cộng đồng tăng, các cá nhân hoặc bộ phận bắt chước cách phản ứng này và cũng tăng cầu của họ.
(C) 2007 www.TừĐiểnTiếngViệt.net