According to Donald Noel, ethnic stratification will emerge only when specific ethnic groups are brought into contact with one another, and only when those groups are characterized by a high degree of ethnocentrism, competition, and differential power.
Manut Donald Noel, pahan soroh pacang  kapanggihang yaning wenten kuuban soroh sane masanding sareng soroh tiosan, taler  yaning soroh punika kaciriang olih pahan etnosentrisme, pesaingan , miwah sane madue kekuatan diferensial sane ageng.