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Quantum-like models cannot account for the conjunction fallacy

Thomas Boyer-Kassem, Sébastien Duchêne and Eric Guerci ()
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Thomas Boyer-Kassem: TiLPS - Tilburg Center for Logic, General Ethics, and Philosophy of Science - - Tilburg University
Eric Guerci: GREDEG - Groupe de Recherche en Droit, Economie et Gestion - UNS - Université Nice Sophia Antipolis (... - 2019) - COMUE UCA - COMUE Université Côte d'Azur (2015 - 2019) - CNRS - Centre National de la Recherche Scientifique - UCA - Université Côte d'Azur

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Abstract: Human agents happen to judge that a conjunction of two terms is more probable than one of the terms, in contradiction with the rules of classical probabilities—this is the conjunction fallacy. One of the most discussed accounts of this fallacy is currently the quantum-like explanation, which relies on models exploiting the mathematics of quantum mechanics. The aim of this paper is to investigate the empirical adequacy of major quantum-like models which represent beliefs with quantum states. We first argue that they can be tested in three different ways, in a question order effect configuration which is different from the traditional conjunction fallacy experiment. We then carry out our proposed experiment, with varied methodologies from experimental economics. The experimental results we get are at odds with the predictions of the quantum-like models. This strongly suggests that this quantum-like account of the conjunction fallacy fails. Future possible research paths are discussed.

Keywords: Quantum-like model; Experimental economics; Empirical adequacy; Conjunction fallacy (search for similar items in EconPapers)
Date: 2016
New Economics Papers: this item is included in nep-exp
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Published in Theory and Decision, Springer Verlag, 2016, 81 (4), pp.479-510. ⟨10.1007/s11238-016-9549-9⟩

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Journal Article: Quantum-like models cannot account for the conjunction fallacy (2016) Downloads
Working Paper: Quantum-like Models Cannot Account for the Conjunction Fallacy (2015) Downloads
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DOI: 10.1007/s11238-016-9549-9

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