Decisions without sharp probabilities

Paul Weirich

pp. 213-225

in: Gerhard Heinzmann, Pierre É. Bour, Wilfrid Hodges, Peter Schroeder-Heister (eds), Logic and philosophy of science in Nancy (II), Philosophia Scientiae 19 (1), 2015.

Abstract

Adam Elga [Elga 2010] argues that no principle of rationality leads from unsharp probabilities to decisions. He concludes that a perfectly rational agent does not have unsharp probabilities. This paper defends unsharp probabilities. It shows how unsharp probabilities may ground rational decisions.