Distortion in social choice problems: The first 15 years and beyond

E Anshelevich, A Filos-Ratsikas, N Shah… - arxiv preprint arxiv …, 2021 - arxiv.org
The notion of distortion in social choice problems has been defined to measure the loss in
efficiency--typically measured by the utilitarian social welfare, the sum of utilities of the …

Breaking the metric voting distortion barrier

M Charikar, P Ramakrishnan, K Wang, H Wu - … of the 2024 Annual ACM-SIAM …, 2024 - SIAM
We consider the following well studied problem of metric distortion in social choice. Suppose
we have an election with n voters and m candidates who lie in a shared metric space. We …

Distortion in metric matching with ordinal preferences

N Anari, M Charikar, P Ramakrishnan - … of the 24th ACM Conference on …, 2023 - dl.acm.org
Suppose that we have n agents and n items which lie in a shared metric space. We would
like to match the agents to items such that the total distance from agents to their matched …

[HTML][HTML] Improved metric distortion via threshold approvals

E Anshelevich, A Filos-Ratsikas, C Jerrett… - Artificial Intelligence, 2025 - Elsevier
We consider a social choice setting in which agents and alternatives are represented by
points in a metric space, and the cost of an agent for an alternative is the distance between …

Don't roll the dice, ask twice: the two-query distortion of matching problems and beyond

G Amanatidis, G Birmpas… - Advances in …, 2022 - proceedings.neurips.cc
In most social choice settings, the participating agents express their preferences over the
different alternatives in the form of linear orderings. While this clearly simplifies preference …

Ordinal approximation for social choice, matching, and facility location problems given candidate positions

E Anshelevich, W Zhu - ACM Transactions on Economics and …, 2021 - dl.acm.org
In this work, we consider general facility location and social choice problems, in which sets
of agents A and facilities F are located in a metric space, and our goal is to assign agents to …

Metric-distortion bounds under limited information

I Anagnostides, D Fotakis, P Patsilinakos - Journal of Artificial Intelligence …, 2022 - jair.org
In this work, we study the metric distortion problem in voting theory under a limited amount of
ordinal information. Our primary contribution is threefold. First, we consider mechanisms that …

Utilitarians without utilities: Maximizing social welfare for graph problems using only ordinal preferences

B Abramowitz, E Anshelevich - Proceedings of the AAAI Conference on …, 2018 - ojs.aaai.org
We consider ordinal approximation algorithms for a broad class of utility maximization
problems for multi-agent systems. In these problems, agents have utilities for connecting to …

Impartial selection and the power of up to two choices

A Bjelde, F Fischer, M Klimm - ACM Transactions on Economics and …, 2017 - dl.acm.org
We study mechanisms that select members of a set of agents based on nominations by other
members and that are impartial in the sense that agents cannot influence their own chance …

A few queries go a long way: Information-distortion tradeoffs in matching

G Amanatidis, G Birmpas, A Filos-Ratsikas… - Journal of Artificial …, 2022 - jair.org
Abstract We consider the One-Sided Matching problem, where n agents have preferences
over n items, and these preferences are induced by underlying cardinal valuation functions …