Ralph watches as a customer with at least 40 items lines up at his express checkout line.He decides the customer must be a real "idiot" to miss the sign that indicates Ralph's checkout line is an express line with a limit of 10 items.What is illustrated by this example

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The example illustrates fundamental attribution error because Ralph assumes the customer's behavior (lining up with more than 10 items) is due to their personality or character trait (being an "idiot"). However, he fails to consider situational factors such as the possibility that the customer may have missed the sign or was not aware of the limit. This is a common error where people tend to overemphasize dispositional factors and underestimate situational factors when explaining other people's behavior.

Ralph Watches as a Customer with at Least 40 Items