The rule used by the United States Figure Skating Association and the International Skating Union, hereafter the ISU Rule, to aggregate individual rankings of the skaters by the judges into a final ranking, is an interesting example of a social welfare function. This rule is examined thoroughly...

Condorcet (1785) initiated the statistical approach to vote aggregation. Two centuries later, Young (1988) showed that a correct application of the maximum likelihood principle leads to the selection of rankings called Kemeny orders, which have the minimal total number of disagreements with...

Given the choice sets produced by a pair of Condorcet social choice correspondences, the following interesting questions arise. Does one of these sets always contain the other? If not, do they always intersect or, on the contrary, can they have an empty intersection? Laffond, Laslier, and Le...