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Monotonicity anomalies in Scottish local government elections

Author

Listed:
  • David McCune

    (William Jewell College)

  • Adam Graham-Squire

    (High Point University)

Abstract

The single transferable vote (STV) voting method is used to elect multiple candidates in ranked-choice elections. One weakness of STV is that it fails multiple fairness criteria related to monotonicity and no-show paradoxes. We analyze 1079 local government STV elections in Scotland to estimate the frequency of such monotonicity anomalies in real-world elections, and compare our results with prior empirical and theoretical research about the rates at which such anomalies occur. In 62 of the 1079 elections we found some kind of monotonicity anomaly. We generally find that anomaly rates are similar to prior empirical research and much lower than what most theoretical research has found. Most STV anomalies we find are the first of their kind to be documented in real-world multiwinner elections.

Suggested Citation

  • David McCune & Adam Graham-Squire, 2024. "Monotonicity anomalies in Scottish local government elections," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 63(1), pages 69-101, August.
    • Handle: RePEc:spr:sochwe:v:63:y:2024:i:1:d:10.1007_s00355-024-01522-5
    DOI: 10.1007/s00355-024-01522-5
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    References listed on IDEAS

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