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Epistemic democracy with defensible premises

Franz Dietrich and Kai Spiekermann ()
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Kai Spiekermann: LSE - London School of Economics and Political Science

Université Paris1 Panthéon-Sorbonne (Post-Print and Working Papers) from HAL

Abstract: The contemporary theory of epistemic democracy often draws on the Condorcet Jury Theorem to formally justify the 'wisdom of crowds'. But this theorem is inapplicable in its current form, since one of its premises -- voter independence -- is notoriously violated. This premise carries responsibility for the theorem's misleading conclusion that 'large crowds are infallible'. We prove a more useful jury theorem: under defensible premises, 'large crowds are fallible but better than small groups'. This theorem rehabilitates the importance of deliberation and education, which appear inessential in the classical jury framework. Our theorem is related to Ladha's (1993) seminal jury theorem for interchangeable ('indistinguishable') voters based on de Finetti's Theorem. We also prove a more general and simpler such jury theorem.

Keywords: Epistemic Democracy; Condorcet Jury Theorem; Competence; Dependence between voters; Common Causes (search for similar items in EconPapers)
Date: 2013
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Published in Economics and Philosophy, 2013, 29, pp.87-120. ⟨10.1017/s0266267113000096⟩

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Working Paper: Epistemic democracy with defensible premises (2013)
Working Paper: Epistemic democracy with defensible premises (2012) Downloads
Working Paper: Epistemic democracy with defensible premises (2010) Downloads
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Persistent link: https://EconPapers.repec.org/RePEc:hal:cesptp:halshs-00978008

DOI: 10.1017/s0266267113000096

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