When people believe in a familiar cultural myth, they modify their actions to support the myth. This is called

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A self-fulfilling prophecy occurs when an individual's belief about a situation or event leads to behavior that ensures the belief becomes true. In this case, believing in a cultural myth modifies an individual's actions in a way that supports the myth, making it a self-fulfilling prophecy.

When People Believe in a Familiar Cultural Myth, They Modify