Living without state-independence of utilities


Theory and Decision

octobre 2009, vol. 67, n°4, pp.405-433

Départements : Economie et Sciences de la décision, GREGHEC (CNRS)

This article is concerned with the representation of preferences which do not satisfy the ordinary axioms for state-independent utilities. After suggesting reasons for not being satisfied with solutions involving state-dependent utilities, an alternative representation shall be proposed involving state-independent utilities and a situation-dependent factor. The latter captures the interdependencies between states and consequences. Two sets of axioms are proposed, each permitting the derivation of subjective probabilities, state-independent utilities, and a situation-dependent factor, and each operating in a different framework. The first framework involves the concept of a decision situation--consisting of a set of states, a set of consequences and a preference relation on acts; the probabilities, utilities and situation-dependent factor are elicited by referring to other, appropriate decision situations. The second framework, which is technically related, operates in a fixed decision situation; particular "subsituations" are employed in the derivation of the representation. Possible interpretations of the situation-dependent factor and the notion of situation are discussed.Studies, Decision making models, Decision theory