Disagreement in a Group: Aggregation, Respect for Evidence, and Synergy

In Fernando Broncano-Berrocal & Adam Carter (eds.), The Epistemology of Group Disagreement. Routledge. pp. 184-210 (2021)
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When members of a group doxastically disagree with each other, decisions in the group are often hard to make. The members are supposed to find an epistemic compromise. How do members of a group reach a rational epistemic compromise on a proposition when they have different (rational) credences in the proposition? I answer the question by suggesting the Fine-Grained Method of Aggregation, which is introduced in Brössel and Eder 2014 and is further developed here. I show how this method faces challenges of the standard method of aggregation, Weighted Straight Averaging, in a successful way. One of the challenges concerns the fact that Weighted Straight Averaging does not respect the evidential states of agents. Another challenge arises because Weighted Straight Averaging does not account for synergetic effects.

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Anna-Maria Asunta Eder
University of Cologne


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