A waitress assumes a group of poorly dressed customers to be ungenerous tippers. She doesn't pay much attention to them during their meal, forgets to bring their drinks, and doesn't ask if they want dessert. In the end, she gets the result that she expects, a very small tip. This is an example of

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The self-fulfilling prophecy, also known as the Pygmalion effect, describes the phenomenon in which people's expectations of themselves or others lead them to behave in ways that make those expectations come true. An example is a waitress who expects some poorly dressed customers to be ungenerous tippers, so she pays little attention to them throughout their meal and thereby receives a much lower tip than usual, fulfilling her expectations.

A Waitress Assumes a Group of Poorly Dressed Customers to Be