82 THEORIES OF ETHNICITY existence of basic ethnie categories would seem to be a facror encouraging the proliferation of culrural differentiae. ln such systerns, the sanctions producing adherence to group-specific values are not only exercised by those who share .the identity. Again, other imperative statuses afford a parallel: just as both sexes ridicule the male who is feminine, and a\l classes punish the proletarian who puts on airs, so also can members of aUethnic groups in a poly-ethnie society act to maintain diehotomies and differences. Where social identities are organized and allocated by such principles, there wiJ\ thus be a tendency towards canalization and standardization of interaction and the ernergence ofboundaries which maintain and generate ethnic diversity within larger, encompassing social systerns, IEthnlclty and Polltlcs ABNER COHEN lnterdependence oj ethnic groups The positive bond that connects sev.eral ethnic groups in an encompassing social system depends on the complementariry of the groups with respect to some of their characteristie culrural features. Such complementarity can give rise to interdependence or symbiosis, and constitutes the areas of articulation referred to above; while in the fields where there is no complementarity there can be no basís for organization on ethnic lines-there wil\ either be no interaction, or interaction without reference to ethnic identity. Social systems differ greatly in the extenr to which ethnic identity, as an imperative status, constrains the person in the variety of staruses and roles he . may assume. Where the dístinguishing values connected with ethnic identity are relevant only to a few kinds of activities, the social organization based on it will be-similar1y limited. Cornplex polyethnic systems, on the other hand, clear1yentail the existence of extensively relevant value differences and multiple constraints on status combinations and social participation. In such sysrerns, the boundary maintaining mechanisms must be highly effective, for the following reasons: (i) the complexity is based on the existence of important, complementary cultural differences; (ii) these differences must be genera\ly standardized within the ethnie group--i.e. the status cluster, or social person, of every member of a group must be highly stereotyped-so that inter-ethnic interaction can be based on ethnie identities; and (iii) the cultural characteristics of each ethnie group must be stable, so that the complementary differences on whieh the systems rest can persist in the face of close inter-ethnie contact, Where these conditions obtain, ethnic groups can make stable and symbiotie adaptations to each other: other ethnic groups in the region become a part of the natural environment;" the sectors of artieulation provide areas that can be exploited, while the other sectors of activity of other groups are largely irrelevant frorn the point of view of members of any one group. [Elhnic Groups and Boundari