Tribal society is marked by the following characteristics:
  1.  moderate population densities, between 100 and 300/sq. mile
  2.  sedentarism, i.e., settlement in permanent villages
  3.  localized unilineal descent groups that allocate land use and assume other corporate functions
  4.  intergroup integration through the development of pan-tribal sodalities, such as age grades
  5. absence of
    1. occupational specialization,
    2. wealth stratification,
    3. political centralization

Agricultural systems