mass psychology; crowd psychology; mob psychology
Refers to the psychological dynamics of large groups, often in contexts of collective behavior, panic, or social influence.
Due to crowd psychology, even calm people can sometimes fall into a panic.
herd mentality; group mind
Describes the tendency of individuals to conform to group behavior or thinking, often used in discussions of social conformity and decision-making.
投資の世界では、群集心理がバブルを引き起こすことがある。
In the world of investing, herd mentality can sometimes cause bubbles.