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<p>Apportionment refers to the well-studied problem of allocating legislative seats among parties or groups with different entitlements. We present a multi-level generalization of apportionment where the groups form a hierarchical structure, which gives rise to stronger versions of the upper and lower quota notions. We show that running Adams’ method level-by-level satisfies upper quota, while running Jefferson’s method or the quota method level-by-level guarantees lower quota. Moreover, we prove that both quota notions can always be fulfilled simultaneously.</p>

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On multi-level apportionment

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月11日

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  • Ulrike Schmidt-Kraepelin,
  • Warut Suksompong,
  • Steven Wijaya

摘要

Apportionment refers to the well-studied problem of allocating legislative seats among parties or groups with different entitlements. We present a multi-level generalization of apportionment where the groups form a hierarchical structure, which gives rise to stronger versions of the upper and lower quota notions. We show that running Adams’ method level-by-level satisfies upper quota, while running Jefferson’s method or the quota method level-by-level guarantees lower quota. Moreover, we prove that both quota notions can always be fulfilled simultaneously.