Classification of truth revealing social choice algorithms

-- Valentin Dardilhac (LISN, Galac)

Time: 14:00 -- Location: LRI, 445

summary: The talk will be on the field of social choices. A group of players
want to choose a subset of a set of objects respecting some properties
(maximal weight of the subset, maximal amount of objects in the subset, ...). To do so, they vote and use a social choice algorithm to elect the winning subset.
Most of the algorithms we studied aim to solve an optimization problem: maximizing the social welfare, maximizing the social utility of the
least pleased player, etc. Our goal is to find algorithms which show the property of
strategy-proofness: The player's incentive should be to tell the truth.
Most of the optimal algorithms do not satisfy this property. Worse:
if the algorithm allows to learn and use data on player utilities, it gets easier for these players to lie and obtain a better utility. The following question emerges from these facts: Can we classify social choice algorithms based on strategy-proofness? We will show some examples of strategy-proof and not strategy-proof algorithms, some more general
classes which are or are not strategy-proof and talk about some ongoing work with Johanne Cohen, Victor Glaser, and Daniel Cordeiro to extend this classification.

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