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<p>In his work “A System of Logic”, John Stuart Mill presented four methods of experimental inquiry, structured into five canons, aimed at determining the circumstances that relate to the considered phenomenon by an invariable law. This study delves into Mill’s methods through the lens of social choice theory and discovers the synchronicity between these theories. Our primary finding is that Approval Voting and the Leximax rule are characterized by consistently (and neutrally) extending Mill’s first canon (the method of agreement) and his second canon (the method of difference). Furthermore, we explore the interplay among the five canons. Our findings demonstrate that the Leximax rule successfully adheres to the first four canons while maintaining consistency and neutrality. These results underscore the intricate connection between causal inference and social choice theory, establishing a foundational link for the application of preference aggregation theory to data aggregation in causal inference and vice versa.</p>

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Revisiting J. S. Mill’s methods: causal inference and social choice theory

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月28日

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  • Takahiro Suzuki,
  • Masahide Horita

摘要

In his work “A System of Logic”, John Stuart Mill presented four methods of experimental inquiry, structured into five canons, aimed at determining the circumstances that relate to the considered phenomenon by an invariable law. This study delves into Mill’s methods through the lens of social choice theory and discovers the synchronicity between these theories. Our primary finding is that Approval Voting and the Leximax rule are characterized by consistently (and neutrally) extending Mill’s first canon (the method of agreement) and his second canon (the method of difference). Furthermore, we explore the interplay among the five canons. Our findings demonstrate that the Leximax rule successfully adheres to the first four canons while maintaining consistency and neutrality. These results underscore the intricate connection between causal inference and social choice theory, establishing a foundational link for the application of preference aggregation theory to data aggregation in causal inference and vice versa.