Conjunction Fallacy
Conjunction fallacy is a cognitive bias where people judge the probability of two events occurring together as greater than the probability of either event alone, violating basic probability principles.
Example: In a vignette about a person described as highly active in social causes, a study asks whether it is more probable that the person is a bank teller or that the person is a bank teller and active in the feminist movement. Many participants choose the conjunction, illustrating the conjunction fallacy.
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