This paper introduces and investigates the concept of repetitive risk aversion. The risk aversion of an increasing and concave utility function is repetitive if the fear of ruin, which measures agent's aversion to risking his entire income, is also increasing and concave. This is shown to be...

Define the riskiness of a gamble as the reciprocal of the absolute risk aversion (ARA) of an individual with constant ARA who is indifferent between taking and not taking that gamble. We characterize this index by axioms, chief among them a “duality” axiom which, roughly speaking, asserts...

Constant risk aversion means that adding the same constant to all outcomes of two distributions, or multiplaying all their outcomes by the same positive constant, will not change the preformence relation between them. In this paper we prove several representation theorems, where constant risk...

We analyze an alternative to the standard rationalizability requirement for observed choices by considering non-deteriorating selections. A selection function is a generalization of a choice function where selected alternatives may depend on a reference (or status quo) alternative in addition to...

In a previous paper, Abouda and Chateauneuf proved that for RDEU maximizing MM with non-increasing marginal utility, positivity of the bid-ask spread can be identified with a very weak form of risk aversion SMRA. We perform here a more thorough study of SMRA, firstly in a general setting, and...

Risk a basic parameter of portfolio selection and its modelling involves some difficulties. Thus, more and more researchers try to find a solution to this problem proposing other measures than the classic ones used in portfolio selection. On the other hand, Multicriteria Decision Aid has known a...

The first part of this paper considers the cognition of individuals ans groups of individuals in the context of organisational project risk analysis and management, and attempts to characterise a set of models of cognition which may be of value as conceptual tools for risk analysts and managers....

Proposals and recommendations have been made in a number of reports in an attempt to encourage firms to adopt of "best practice", as identified by the Group of Thirty, through public disclosure requirements and rules for determining the amount of regulatory capital to support trading and...