Nomads lifestyle rely on collective ownership. The unit is the tribe, not the individual. The more heterogeneous the tribe the strongest it is because each members benefits from the talents of the others.
Sharing is not limited to material good or services. Sharing of knowledge and values insures the survival of the tribes identity. Communities sharing information, knowledge and goods seem to re-emerge in postmodern societies.
For instance, electronic music producers sample existing beats to produce new sounds. In return their music is re-use and re-mixed, increasing the notoriety of the sound and the collective capital of music producers.