Whether or not a teacher is aware of it, the self-fulfilling prophecy is at work, impacting students either to their benefit or their detriment. (Educational psycology)

According to The Law of Self-fulfilling Prophecy, people respond the way you expect them to respond. You get what you expect. (terrybragg.com )

However, those who see technical analysis as a self-fulfilling prophecy argue that these indicators are "right" only because extremely large numbers of people base trading decisions on these same indicators, thereby using the same information to take their positions, and, in turn, pushing the price in the predicted direction. (Investopedia)