Ethnicity without groups

Few social science concepts would seem as basic, even indispensable, as that of group. In disciplinary terms, "group" would appear to be a core concept for sociology, political science, anthropology, demography, and social psychology. In substantive terms, it would seem to be fundamental to the study of political mobilization, cultural identity, economic interests, social class, status groups, collective action, kinship, gender, religion, ethnicity, race, multiculturalism, and minorities of every kind.