The study that started it

In 1968, Robert Rosenthal and Lenore Jacobson told teachers at a San Francisco elementary school that a fictitious test had identified certain students as poised to bloom academically. These students were randomly selected. By the end of the year, the designated bloomers significantly outperformed their peers. The teachers had not been told to treat them differently. They did so anyway — unconsciously — and the performance gap they predicted materialised.

A caveat the article owes: the original study has been criticised for small samples and methodological limitations, and later research in ordinary classrooms found smaller effects, accounting for roughly 5–10% of students’ achievement variance. The original dramatic finding has not been fully replicated at its original magnitude. The Pygmalion effect is real but modest in classroom settings. The workplace extension — where managers have more sustained, more consequential, and more diverse contact with employees than teachers have with individual students — may produce larger effects, but this is inference rather than direct evidence from the classroom data.

With that caveat stated, Dov Eden’s controlled experiments in military and industrial settings provide the workplace evidence directly. And those findings are commercially significant.

How expectations transmit without words

Rosenthal’s subsequent research identified four behavioural channels through which expectations transmit from manager to employee, none of which requires the expectation to be stated explicitly. Climate: managers create warmer socioemotional environments for employees they believe in. Input: they assign more challenging and visible work to high-expectancy employees. Output: they invite more contribution from those they believe have potential. Feedback: they give more specific, detailed, and developmental feedback to people they expect to do well.

A manager who believes an employee is high-potential does not need to say so. The four-factor mechanism operates through the texture of every interaction — the quality of attention in a one-to-one, the stretch in a project assignment, the specificity of a comment in a review, the spontaneity of including someone in a high-stakes meeting. The employee receives a systematically different experience than their low-expectancy colleague, and over time those differential experiences produce differential development. The manager then observes the performance gap they predicted and concludes their original assessment was accurate — a closed feedback loop that manufactured the reality it anticipated.

The negative direction: the Golem effect

The Pygmalion mechanism operates symmetrically in the negative direction, named the Golem effect. Low managerial expectations produce cooler interactions, less challenging work, fewer opportunities to contribute, and less developmental feedback — all of which systematically reduce the performance the manager predicted would be low.

The Golem effect is often the more commercially consequential direction for entrepreneurs. The employee written off early, assigned to lower-stakes work, and given less developmental investment is having their capability actively shaped downward by the managerial belief that preceded any evidence. The manager observes reduced performance and concludes their original assessment was accurate — without recognising that the reduced performance was produced by the treatment that followed the assessment, not by the employee’s inherent capability. The assessment created the evidence for itself.

The self-concept mechanism underneath

The four-factor transmission mechanism works because it changes how the employee sees themselves. When a manager’s consistent high-expectancy behaviour signals to an employee that they are capable, the employee begins updating their own self-model — their beliefs about what they can do. That updated self-model produces increased willingness to attempt challenging tasks, greater persistence in the face of setbacks, and higher confidence in their own judgment. These are not only motivational changes. They are capability changes, because the tasks the employee now attempts and the persistence they now apply produce genuine skill development that would not have occurred under a low-expectancy regime.

This connects the Pygmalion effect directly to Bandura’s self-efficacy research established earlier in this series. The manager’s Pygmalion behaviour is operationally an intervention on the employee’s self-efficacy, and self-efficacy determines the effort-exposure-learning cycle that produces actual capability over time.

The bias problem that makes this an equity issue

Managers do not form high and low expectations randomly. Research on unconscious bias consistently finds that expectations are systematically influenced by demographic characteristics, educational background, physical appearance, communication style, and cultural similarity to the manager. This means the Pygmalion effect does not merely shape individual performance — it amplifies existing structural inequalities by directing the developmental resources that high expectations bring toward employees who already have structural advantages.

The practical implication is specific: the solution is not to avoid forming expectations, but to deliberately audit whose work receives the most developmental attention and to ask whether those investment patterns are based on genuine evidence of potential or on demographic proxies activating unconscious high-expectancy treatment.

The meta-analytic evidence from workplace settings

McNatt’s 2000 meta-analysis of 17 workplace Pygmalion studies across 2,874 participants found an average effect size of d = 1.13 — by social science standards a large effect. The workplace effect appears larger than the classroom effect, consistent with the hypothesis that more sustained manager-employee contact amplifies the four-factor transmission mechanism. This converts the Pygmalion effect from a theoretical curiosity into a practical leadership lever: the manager who deliberately audits and upgrades their expectations of team members — without changing the formal reward structure, job design, or resource allocation — is making an intervention with a documented large average effect on performance. That is a higher expected return than most formal training programmes, and it costs nothing except the psychological work of genuinely updating beliefs about what the team is capable of.

A book worth reading alongside this

The Art of Possibility by Rosamund Stone Zander and Benjamin Zander is one of the most directly applicable treatments of the Pygmalion mechanism available outside academic literature. Benjamin Zander, conductor of the Boston Philharmonic, documents his practice of giving every student in his master class an A at the start of the year — not as a grade to be earned but as an expectation to be inhabited. His account of what happened to students’ performance, confidence, and creative risk-taking when the expectation of excellence was established rather than withheld maps precisely onto the four-factor transmission mechanism the article describes. Zander’s framing — that the conductor’s job is to make other people powerful — is the practitioner version of the Pygmalion insight: the leader’s belief in the team is not a private feeling but a force that shapes what the team becomes. For any entrepreneur who wants to understand what deliberately high-expectancy leadership looks and feels like from the inside, this is the most readable and most practically vivid account available.

Have questions about this article?

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This article is for educational and informational purposes only. Sources: Rosenthal, R. & Jacobson, L. (1968), The Urban Review, 3, 16–20. Eden, D. & Shani, A.B. (1982), Journal of Applied Psychology, 67(2), 194–199. McNatt, D.B. (2000), Journal of Applied Psychology, 85(2), 314–322. Babad, E.Y., Inbar, J. & Rosenthal, R. (1982), Journal of Educational Psychology, 74(4), 459–474.