OpenAlex ·
Bi-Compositional Division Rules
- Published
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- OpenAlex
- DOI
- 10.48550/arxiv.2609.01489
- Original
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- Topics
Abstract
We characterise the division rules for claims problems that satisfy equal treatment of equals, bilateral consistency, composition down, and composition up. The rules are precisely the members of a one-parameter log-exponential family $\{r^θ\}_{θ\in[-\infty,+\infty]}$, with constrained equal awards (CEA) and constrained equal losses (CEL) as its endpoints. For finite $θ$, $r^θ$ is the equal-sacrifice rule in awards for $u_θ=\logφ_θ$, where \[ φ_θ(x):=\frac{e^{θx}-1}θ\quad(θ\ne0), \qquad φ_0(x):=x, \] and simultaneously the equal-sacrifice rule in losses for the dual utility $u_{-θ}$. The proportional rule is the midpoint, $θ=0$. Continuity of the rules are not assumed but a consequence of the other axioms.
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