Abstract
At the point of choice, let N be the delay in learning the outcome. Then von Neumann and Morgenstern's postulates contradictorily imply that N = 0 and N > 0. As a consequence, Savage's ‘sure-thing’ proof, which has bestowed on expected utility theory most of its normative appeal, depends on inconsistent assumptions. Further, the validity of Savage's proof cannot be retrieved by minimizing N > 0, by making the delay a mere moment or so. The historical origins of these contradictions are traced to (i) von Neumann and Morgenstern inadvertently limiting their risk model to the certain period, that is the period after gamblers learn the outcome(s), and (ii) Savage's use of the sure-thing principle for analysing “atemporally but also quite formally” compound gambles [Savage, 1954, p. 23].
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Pope, R. Timing contradictions in von Neumann and Morgenstern's axioms and in savage's ‘sure-thing’ proof. Theor Decis 18, 229–261 (1985). https://doi.org/10.1007/BF00126593
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DOI: https://doi.org/10.1007/BF00126593