A self-fulfilling prophecy is a prediction that, in being made, actually causes itself to become true. For example, in the stock market, if it is widely believed that a crash is imminent, investors may lose confidence, sell most of their stock, and actually cause the crash. Or, if a candidate in an election openly declares they do not believe they can win, this may increase voter apathy and result in poor support for their campaign.
Self-fulfilling prophecies are often seen as similar to the predestination paradox, in which a person travels back in time to prevent an event, but ends up causing it. These two phenomena differ on a key point however. A self-fulfilling prophecy is when a person with knowledge of future events alters his behaviour in a way that ends up causing these events. On the other hand, a predestination paradox is when a person with knowledge of past events goes back in time, and ends up causing the events.
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