 Dwight Newman (2011, 4) distinguishes in a similar fashion between “sets” and “collectivities”. A set, like French’s aggregate, becomes a different set each time its membership changes. A collectivity, by contrast, remains identifiable as the same collectivity even though its membership changes. For both French and Newman, a group’s having an identity that survives changes in its membership is essential to its being the kind of group that might bear rights. (See also Graham 2002, 68–9; List and Pettit 2011, 31–32; Van Dyke 1977.)