Discussion Papers,
Norwegian School of Economics, Department of Business and Management Science

Abstract: Quantitative probability in the subjective theory is assumed to be finitely additive and defined on all the subsets of an underlying state space. Functions from this space into an Euclidian n-space create a new probability space for each such function. We point out that the associated probability measures, induced by the subjective probability, on these new spaces can not be finitely additive and defined on all the subsets of Euclidian n-space, for n ≥ 3. This is a consequence of the Banach-Tarski paradox. In the paper we show that subjective probability theory, including Savage’s theory of choice, can be reformulated to take this, and similar objections into account. We suggest such a reformulation which, among other things, amounts to adding an axiom to Savage’s seven postulates, and then use a version of Carathéodory’s extension theorem.

Keywords: The Banach-Tarski paradox; the axiom of choice; Savage’s theory of choice; monotone continuity; countable additivity; Carathéodory’s extension theorem; syndicates; contingent claims

JEL-codes: C00; C10; C25; G10; G12; G13

Language: English

18 pages, September 29, 2023

Full text files

3093652  Full text

Download statistics

• Norwegian School of Economics, Department of Business and Management Science
• Ordering Working Papers
• Home page for this series

Questions (including download problems) about the papers in this series should be directed to Stein Fossen ()
Report other problems with accessing this service to Sune Karlsson ().

RePEc:hhs:nhhfms:2023_015This page generated on 2024-09-13 22:16:23.