Effie was a victim of the Peter principle because after being promoted to a director position, she discovered that she did not have the qualifications or skills the position required.
According to the Peter principle, a person who excels at their current work will be promoted to a position requiring new talents. The person who was promoted won't get another promotion if they don't have the abilities needed for the new position. If the person does well in the new position, they will be promoted once again and then again until they reach a level at which they are incompetent. The person won't be able to advance again because to their incompetence, therefore they'll be locked at this position or Peter's plateau. Given enough time and hierarchy positions to which capable workers may be elevated, this result is inevitable.
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