An expectation of one's own or another person's behavior that comes true because of the tendency of the person holding it to act in ways that bring it about is called

self-fulfilling prophecy

Explanation:

The self-fulfilling prophecy is a theory developed in 1928 by the American sociologist William Isaac Thomas. According to this theory, a prediction or expectation could result in a desired or expected outcome.

This theory suggests that an individual's actions are influenced by their beliefs. The theory is based on the principle that people make inferences about other people or events on the basis of their previous experience and knowledge.

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