The interference problem for the betting interpretation of degrees of belief

Synthese 190 (5):809-830 (2013)
Abstract
The paper’s target is the historically influential betting interpretation of subjective probabilities due to Ramsey and de Finetti. While there are several classical and well-known objections to this interpretation, the paper focuses on just one fundamental problem: There is a sense in which degrees of belief cannot be interpreted as betting rates. The reasons differ in different cases, but there’s one crucial feature that all these cases have in common: The agent’s degree of belief in a proposition A does not coincide with her degree of belief in a conditional that A would be the case if she were to bet on A, where the belief in this conditional itself is conditioned on the supposition that the agent will have an opportunity to make such a bet. Even though the two degrees of belief sometimes can coincide (they will coincide in those cases when the bet has no expected causal bearings on the proposition A and the opportunity to bet have no evidential bearings on that proposition), it is the latter belief rather than the former that guides the agent’s rational betting behaviour. The reason is that this latter belief takes into consideration potential interferences that bet opportunities and betting itself might create with regard to the proposition to be betted on. It is because of this interference problem that the agent’s degree of belief in A cannot be interpreted as her betting rate for A
Keywords Belief  Probability  Bets  Betting interpretation  Betting rate  Conditionals  Causal decision theory  Sleeping beauty  Ramsey  de Finetti
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T. Seidenfeld, M. J. Schervish & J. B. Kadane (1990). When Fair Betting Odds Are Not Degrees of Belief. PSA: Proceedings of the Biennial Meeting of the Philosophy of Science Association 1990:517 - 524.
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