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Global independence of irrelevant alternatives, state-salient decision rules and the strict Condorcet choice function Cover

Global independence of irrelevant alternatives, state-salient decision rules and the strict Condorcet choice function

By: Somdeb Lahiri  
Open Access
|May 2025

Abstract

We present a simple proof of a well-known axiomatic characterization of state-salient decision rules, using Weak Dominance Criterion and Global Independence of Irrelevant Alternatives. Subsequently, we provide a simple axiomatic characterization of the Strict-Condorcet choice function on the domain of all preference profiles that have a strict-Condorcet winner, assuming that if the first two ranks are “occupied by the same two alternatives in all states of nature”, then the chosen alternative will be the one from these two that is preferred to the other with probability greater than half -provided such an alternative exists. We also show that this result is not valid if we extend the domain to the set of all preference profiles that have a unique weak-Condorcet winner.

DOI: https://doi.org/10.2478/candc-2024-0020 | Journal eISSN: 2720-4278 | Journal ISSN: 0324-8569
Language: English
Page range: 457 - 474
Submitted on: Oct 1, 2024
Accepted on: Dec 1, 2024
Published on: May 15, 2025
Published by: Systems Research Institute Polish Academy of Sciences
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year

© 2025 Somdeb Lahiri, published by Systems Research Institute Polish Academy of Sciences
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.