The bandwagon effect; this states that during election people get influenced by polls and just to make their vote count they vote for the winner.
More about The bandwagon effect:
The bandwagon effect is a psychological phenomena in which people act primarily in accordance with the opinions of others, disregarding or superseding their own ideas. Herd mentality is another term for the propensity for individuals to match their thoughts and actions with those of a group.
Although the phrase "bandwagon effect" has political roots, it has broad applications that are frequently seen in investment and consumer behavior. Bull markets and the expansion of asset bubbles are two instances when this behavior is visible.
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