Which bias describes adopting beliefs because everyone around you believes them?

• A. Bandwagon Effect
• B. Hostile Media Effect
• C. Moral Credential Effect
• D. Omission Bias

Answer: (A)

The bandwagon effect is a social conformity bias where people adopt beliefs or behaviors because many others around them hold them, seeking belonging or avoiding social disapproval. When a belief is widely held in your group, you may accept it more readily, assuming that the crowd’s consensus signals truth or value. This makes it the best fit for describing adopting beliefs simply because everyone around you believes them.

For comparison, the hostile media effect is about perceiving media as biased against one’s own side, not about changing beliefs to match others. The moral credential effect involves using past good deeds to justify later unethical actions, not about social adoption of beliefs. Omission bias is the preference for inaction due to perceived risk, rather than conformity to a group's beliefs.