BUSCADOR RECOLECTA

The final publication is available at Springer via http://dx.doi.org/10.1007/s00355-012-0716-9, In this paper, we axiomatically study how to measure the similarity of preferences in a group of individuals. For simplicity, we refer to this as the cohesiveness. First, we provide axioms that characterize a family of linear and additive measures whose intersection is a partial ordinal criterion similar to first order stochastic dominance. The introduction of some additional properties isolates a one-parameter subfamily. This parameter evaluates the effect on the cohesiveness if one individual changes his ranking on a single pair of objects, as a function of how many of the remaining individuals in the group rank the first object over the second and vice versa. Finally, we characterize the focal measures of this subfamily separately showing that they coincide with measures constructed using two, at first sight, totally different approaches suggested in the literature., The author Jorge Alcalde-Unzu gratefully acknowledges financial support from the
Spanish Ministry of Education and Science, through the projects ECO2009-11213 and ECO2009-12836.
The author Marc Vorsatz gratefully acknowledges financial support from the Spanish Ministry of Education
and Science (through the project ECO2009-07530) and from the Spanish Ministry of Economy and Competitiveness
(through the project ECO2012-31985).

The final publication is available at Springer via http://dx.doi.org/10.1007/s00355-012-0689-8, We present a model that is closely related to the so-called models of choice under complete uncertainty, in which the agent has no information about the probability of the outcomes. There are two approaches within the said models: the state space-based approach, which takes into account the possible states of nature and the correspondence between states and outcomes; and the set-based approach, which ignores such information, and solves certain difficulties arising from the state space-based approach. Kelsey (Int Econ Rev 34:297–308, 1993) incorporates into a state space-based framework the assumption that the agent has ordinal information about the likelihood of the states. This paper incorporates this same assumption into a set-based framework, thus filling a theoretical gap in the literature. Compared to the set-based models of choice under complete uncertainty we introduce the information about the ordinal likelihood of the outcomes while, compared to Kelsey’s approach, we incorporate the advantages of describing uncertainty environments from the set-based perspective. We present an axiomatic study that includes adaptations of some of the axioms found in the related literature and we characterize some rules featuring different combinations of information about the ordinal likelihood of the outcomes and information about their desirability., We acknowledge financial support
from the Spanish Ministry of Science and Technology (Projects ECO2008-04756, ECO2009-11213,
ECO2009-12836 and Ramón y Cajal program), the Junta de Castilla y León (Project VA092A08), FEDER,
and the Barcelona Economics Program of CREA.

The final publication is available at Springer via http://dx.doi.org/10.1007/s10888-011-9165-4, Rankings to evaluate opportunity distributions present in most of the literature judge a policy (change from one distribution of opportunities to another) on the basis of the changes created and, thus, independently of the original situation. This paper proposes a group of axioms capturing the idea that rankings of equality of opportunities might consider not only the changes promoted, but also the initial situation in society. The combination of this group of axioms with other well-established properties enables us to characterize two families of new opportunity distribution rankings. The first family weighs each individual’s percentage share in the total number of opportunities, while the second weighs opportunities depending on how many agents have them available., Financial support
from the Spanish Ministry of Education through grants ECO2008-04756, ECO2009-
11213, ECO2009-12836, Juan de la Cierva and Ramon y Cajal programs, FEDER, and
the Barcelona Economics Program of CREA is gratefully acknowledged.

This essay deals with the notion and content of freedom of choice proposing a new set up and a new family of measures for this concept which is, indeed, an ethical value of paramount importance in a well ordered and open society. Following some ideas of John StuartMill, we propose that freedom of choice has to be understood not in a single stage of choice, but in the ordered collection of choices that a person can make in her life.We then suggest to represent a life in a tree structure, where each node
represents a state of life and the edges between nodes will represent possible decisions in life. In this new framework, we propose a set of axioms that imply the following family of measures of lifetime’s freedom of choice: the lifetime’s freedom of choice has to be evaluated by a weighted sum of all possible states of life an individual might visit, with weights representing the number of decisions the individual took to reach that state., Financial support
from the Spanish Ministry of Education through grants ECO2008-04756, ECO2009-11213, ECO2009-
12836, Ramon y Cajal program, FEDER, and the Barcelona Economics Program of CREA is gratefully
acknowledged.

This paper investigates the use of egalitarian criteria to select allocations in bankruptcy problems. In our work, we characterize the sets of Lorenz maximal elements for these problems. We show that the allocation selected by the Proportional Rule is the only allocation that belongs to all these Lorenz maximal sets. We prove that the Talmud Rule selects the lexicographic maximal element within a certain set. We introduce and analyze a new sharing rule for bankruptcy problems that shares strong similarities with the Talmud Rule., J. Arin acknowledges financial support from Project 9/UPV00031.321-15352/2003 of the University of the Basque Country, Projects SEJ-2006-05455 and ECO2009-11213 of the Ministry of Education and Science of Spain and Project GIC07/146-IT-377-07 of the Basque Goverment. Likewise, J. Benito acknowledges financial support from Projects SEJ-2006-11510 and ECO2009-12836 of the Ministry of Education and Science of Spain.