Should Subjective Probabilities Be Sharp?

Authors
Katie Steele
Australian National University
Seamus Bradley
University of Leeds
Abstract
There has been much recent interest in imprecise probabilities, models of belief that allow unsharp or fuzzy credence. There have also been some influential criticisms of this position. Here we argue, chiefly against Elga, that subjective probabilities need not be sharp. The key question is whether the imprecise probabilist can make reasonable sequences of decisions. We argue that she can. We outline Elga's argument and clarify the assumptions he makes and the principles of rationality he is implicitly committed to. We argue that these assumptions are too strong and that rational imprecise choice is possible in the absence of these overly strong conditions.
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DOI 10.1017/epi.2014.8
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References found in this work BETA

Dutch Bookies and Money Pumps.Frederic Schick - 1986 - Journal of Philosophy 83 (2):112-119.
Unsharp Sharpness.Nils‐Eric Sahlin & Paul Weirich - 2014 - Theoria 80 (1):100-103.

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Citations of this work BETA

You’Ve Come a Long Way, Bayesians.Jonathan Weisberg - 2015 - Journal of Philosophical Logic 44 (6):817-834.

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