Majoritarian Assignment Rules
Fuente:
arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| Acceso en línea: | |
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| _version_ | 1866913145811894272 |
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| author | Brandt, Felix Chen, Haoyuan Dong, Chris Lederer, Patrick Schlenga, Alexander |
| author_facet | Brandt, Felix Chen, Haoyuan Dong, Chris Lederer, Patrick Schlenga, Alexander |
| contents | A central problem in multiagent systems is the fair assignment of objects to agents. In this paper, we initiate the analysis of classic majoritarian social choice functions in assignment. Exploiting the special structure of the assignment domain, we show a number of surprising results with no counterparts in general social choice. In particular, we establish a near one-to-one correspondence between preference profiles and majority graphs. This correspondence implies that key properties of assignments -- such as Pareto-optimality, least unpopularity, and mixed popularity -- can be determined solely by the associated majority graph. We further show that all Pareto-optimal assignments are semi-popular and belong to the top cycle. Elements of the top cycle can thus easily be found via serial dictatorships. Our main result is a complete characterization of the top cycle, which implies the top cycle can only consist of one, two, all but two, all but one, or all assignments. By contrast, we find that the uncovered set contains only very few assignments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_14816 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Majoritarian Assignment Rules Brandt, Felix Chen, Haoyuan Dong, Chris Lederer, Patrick Schlenga, Alexander Theoretical Economics Computer Science and Game Theory Multiagent Systems 91B68 (Primary) 91B14 (Secondary) J.4; I.2.11 A central problem in multiagent systems is the fair assignment of objects to agents. In this paper, we initiate the analysis of classic majoritarian social choice functions in assignment. Exploiting the special structure of the assignment domain, we show a number of surprising results with no counterparts in general social choice. In particular, we establish a near one-to-one correspondence between preference profiles and majority graphs. This correspondence implies that key properties of assignments -- such as Pareto-optimality, least unpopularity, and mixed popularity -- can be determined solely by the associated majority graph. We further show that all Pareto-optimal assignments are semi-popular and belong to the top cycle. Elements of the top cycle can thus easily be found via serial dictatorships. Our main result is a complete characterization of the top cycle, which implies the top cycle can only consist of one, two, all but two, all but one, or all assignments. By contrast, we find that the uncovered set contains only very few assignments. |
| title | Majoritarian Assignment Rules |
| topic | Theoretical Economics Computer Science and Game Theory Multiagent Systems 91B68 (Primary) 91B14 (Secondary) J.4; I.2.11 |
| url | https://arxiv.org/abs/2602.14816 |