Stable husbanding of the land requires community-wide language and norms for resolving interpersonal conflict, facilitating barter and trade, determining shares of work and output and maintaining organizational hierarchies. Although such social functions are the requisites of community life everywhere, the ways of performing them evolve differently from place to place. Each society develops its practices and sets of myths, symbols and rational justifications, which usually are held to be superior to those of other societies........And just as material reasons for self-sufficiency can turn communities towards economic imperialism, so the ideational justifications for autonomy can turn them into presumptuous civilizers of other peoples.