The effect of setting high expectations on people, coined the Pygmalion effect, was first postulated in a study of teachers’ impact on students (Rossenthal & Jacobson, 1968) 🔥 In the study, students at an elementary school took intelligence pre-tests 🙌 Rosenthal and Jacobsen then informed the teachers of the names of twenty percent of the students in the school who were showing “unusual potential for intellectual growth” and would bloom academically within the year. Unknown to the teachers, these students were selected randomly, with no relation to the initial test. When Rosenthal and Jacobson tested the students eight months later, they discovered that the group of randomly selected students scored significantly higher. 
Psychologists, too, have picked up the motif, researching what they call the “Pygmalion effect”. The finding, as social psychologist Robert Rosenthal puts it, is “that what one person expects of another can come to serve as a self-fulfilling prophecy.” Rosenthal and his coauthor Lenore Jacobson coined the term to describe the striking results of an experiment they carried out in a California school in 1965. Students took a test that was said to be able to identify “growth spurters,” or those who were poised to make strides academically. Teachers were given the names of pupils who were about to bloom intellectually — and sure enough, these students showed a significantly greater gain in performance over their classmates when tested again at the end of the year. (emended by Eric Ashley from Surakarta, Indonesia on July 6, 2020) 
The specialists at duq.edu
state that pygmalion in Ovid’s Metamorphoses (Book X) was a sculptor who fell in love with an ivory statue of his own making. Enamored by the beauty of his own making, Pygmalion begs the gods to give him a wife in the likeness of the statue. The gods grant the request, and the statue comes to life. George Bernard Shaw adopted Pygmalion for the title of his play about Professor Henry Higgins whose sense of self-efficacy is grandiose: “You see this creature with her curbstone English . . . In three months I could pass that girl off as a duchess at an ambassador’s garden party.” (we truly appreciate Almando Dill for their latest insights). 
According to Marta Corona at hbr.org
, one of the most comprehensive illustrations of the effect of managerial expectations on productivity is recorded in studies of the organizational experiment undertaken in 1961 by Alfred Oberlander, manager of the Rockaway district office of the Metropolitan Life Insurance Company. He had had observed that outstanding insurance agencies grew faster than average or poor agencies and that new insurance agents performed better in outstanding agencies than in average or poor agencies, regardless of their sales aptitude. He decided, therefore, to group his superior agents in one unit to stimulate their performance and to provide a challenging environment in which to introduce new salespeople.