Answer:
self-fulfilling prophecy
Step-by-step explanation:
The concept of self-fulfilling prophecy is not new to psychology. Scholars have already pointed out that an individual's expectation of someone else's behavior can help them behave according to what is expected of them. Such a concept has provoked many interesting discussions between educational psychologists and educators concerned that teachers 'expectations may help or undermine their students' academic and behavioral intellectual development.
The concept of self-fulfilling prophecy occurs when Billy's teacher does not believe him when he says he has not gotten into any trouble and when she repeats that Billy is a troublemaker. With this, she stimulates bad behavior on Billy and influences him to get into more and more confusion.