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The arrow rule, often referred to in the context of social choice theory, is a principle articulated by economist Kenneth Arrow in his "Impossibility Theorem." It states that no voting system can convert individual preferences into a collective decision that meets a specified set of fairness criteria (such as non-Dictatorship, unrestricted domain, and independence of irrelevant alternatives) if there are three or more options. Essentially, it highlights the challenges of achieving a fair and consistent democratic process when aggregating diverse preferences.

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