Many recent works have investigated the question of extending a preference over a set of alternatives to its power set, as a way to provide a formal representation of the notion of freedom of choice. In general, the results are limited to the nite case, which excludes the case of economic...

This work analyzes the problem of individual choice of actions under complete uncertainty. In this context, each action consists of a set of dierent possible outcomes with no probability distribution associated with them. The work examines and de nes a class of choice procedures in which: a):...

This paper explores the introduction of a variable critical-level in a variable population context. We focus the attention on the "Critical- Level Egalitarian Ruleî, a social evaluation procedure which compares two social states as follows: (i) It reproduces the leximin criterion when applied...

Ranking finite subsets of a given set X of elements is the formal object of analysis in this paper. This problem has found a wide range of economic interpretations in the literature. The focus of the paper is on the family of rankings that are additively representable. Existing characterizations...

In this paper we argue, inspired by some psychological literature, that choices are the outcome of the interplay of different, potentially conflicting motivations. We propose an axiomatic approach with two motivations, which we assume to be single-peaked over a certain given dimension. We first...

Recent work by Bossert, Pattanaik and Xu provides axiomatic characterizations ofs ome decision rules for individual decision making under complete uncertainty. This note shows that, in the case oft wo of these rules, they do not satisfy one of the axioms used for their characterization. A...

This paper proposes a new framework of choice under uncertainty, where the only information available to the decision maker is about the the ordinal likelihood of the di erent outcomes each action generates. This contrasts both with the classical models where the potential out- comes of each...

This paper is devoted to the study of opportunity sets comparisons when the sets may contain options whose characteristics are not completely known. We propose a suitable environment in which this problem can be approached, and provide axiomatic characterizations of several rules for ranking...

In this paper we characterize axiomatically a ranking method that compares positions in hierarchies in terms of the influence that they provide on the evolvement of knowledge. The comparison takes into account the number of direct and indirect subordinates of the positions and is based on the...

This paper is devoted to the study of opportunity set comparisons when the characteristics of the options within the sets in question may be ambiguous. We assume that agents display a preference for freedom of choice, but also aversion to the presence of ambiguous options. We propose a suitable...