We study direct democracy with population uncertainty. Voters’ participation is often among the desiderata by the election designer. We show that with a participation quorum, i.e. a threshold on the fraction of participating voters below which the status quo is kept, the status quo may be kept...

The achievements and limitations of the classical theory of optimal labor-income taxation based on social welfare functions are now well known, although utilitarianism still dominates public economics. We review the recent interest that has arisen for broadening the normative approach and making...

We present the Fair Social Ordering approach to policy assessment. In an economic model, a Social Ordering Function (SOF) associates each economy in the domain with a complete ranking of the allocations. We describe the main achievements of the SOF theory. We present two applications, which show...

Judgment (or logical) aggregation theory is logically more powerful than social choice theory and has been put to use to recover some classic results of this field. Whether it could also enrich it with genuinely new results is still controversial. To support a positive answer, we prove a social...

Nous proposons une méthode pour évaluer la capacité des systèmes de taxation du revenu de diminuer la pauvreté, lorsque celle-ci est définie en cohérence avec une notion de niveau de vie issue de l’éthique de la responsabilité. Selon cette éthique, toutes les inégalités ne sont pas...

We propose a new class of multidimensional poverty indices. To aggregate and weight the different dimensions of poverty, we rely on the preferences of the concerned agents rather than on an arbitrary weighting scheme selected by the analyst. The Pareto principle is, therefore, satisfied among...

A social choice correspondence (SCC) is virtually implementable if it is e-close (in the probability simplex) to some (exactly) implementable correspondence. Abreu and Sen (1991) proved that, without restriction on the set of alternatives receiving strictly positive probability at equilibrium,...

The adoption of gender quotas inpart y lists has beena voluntary decision by many parties in many countries, and is now a subject of discussioninman y others. The Parity Low passed inF rance in 2001 is particularly interesting because for the first time the quota was set at 50 percent, and the...

In a model where agents have unequal production skills and different preferences, we build social welfare functions which rely only on ordinal non-comparable information on individual preferences. Social welfare functions are required to satisfy properties of compensation for inequalities in...