Anthropologists have repeatedly proven how valuable this cultural comparison is in research on primitive nations. Formal customs of a tribe maybe 90% the same as those of neighboring tribes, but they just deny the core basic institutions. Arrangements, no matter how small their ratio, on the whole, could make the future of the nation in a unique direction. The text is intended to emphasize:. ['In primitive ethnic studies, cultural comparison is the most important research method.', 'There are both similarities and essential differences between the formal customs of nearby tribes.', 'Basic institutional arrangements account for a small percentage of the tribal formal customs.', 'Basic institutional arrangements may determine the development direction of a nation.']