It is argued that if a finite partially ordered population is given, and incomparability is taken as the relevant type of dissimilarity, then diversity comparisons between subpopulations may be conveniently based on widths namely on the maximum number of pairwise incomparable units they include....

A voting protocol is said to be strongly β-participatory if for any voter i and any strategy profile either the outcome is i′s preferred one or i has a sincere strategy which would ensure her a better outcome, and VNM-strategy-proof if at any preference profile the set of sincere strategies...