A plural society is defined by Fredrik Barth as a society combining ethnic contrasts: the economic interdependence of those groups, and their ecological specialization (i.e., use of different environmental resources by each ethnic group). The ecological interdependence, or the lack of competition, between ethnic groups may be based on the different activities in the same region or on long–term occupation of different regions in the same nation–state. In Barth’s view, ethnic boundaries are most enduring and stable when groups occupy different ecological niches; simply, they make their living in different ways and don’t compete. When different ethnic groups exploit the same ecological niche, the militarily more powerful group will normally replace the weaker one. However, if the weaker group