Preliminary versions of most of the papers in this special issue of Annals of Economics and Statistics were presented at the annual conference of the ADRES (Association pour le Développement de la Recherche en Economie et Statistiques). This conference, untitled ``New Developments in Social...

In this article we employ the theory of power indices to evaluate the respective influence of the two classes of electors in the polling method introduced by the electoral law of 29 June 1820, a method known as the law of “double vote”. We will show, using amplified model, that the voting...

The Condorcet Efficiency of a voting rule is defined as the conditional probability that the voting rule elects the Pairwise Majority Rule Winner (PMRW), given that a PMRW exists. Five simple voting rules are considered in this paper: Plurality Rule, Negative Plurality Rule, Borda Rule,...

A well-known result in Social Choice theory is the following: every scoring rule violates the majority principle as defined by Condorcet. In this paper, we investigate some limits of this negative result. Some weakened versions of Condorcet principle are introduced and we characterize those...