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Money Economy.  Intra-tribe barter may become inter-tribal barter and eventually, for ease of transfer, the infusion of value into symbolic goods and the creation of a money economy.  As value accrues to scarce materials such as gold, silver, bronze, (perhaps through artisans’ desire for them) these materials become a currency.  Artisans can acquire them through intra-tribal exchange; others can acquire them through discover or through conquest.   The complicated, stable, sedentary, hierarchical, specialized, state-organized society generates tremendous pressure for barter and symbolic barter to begin and increase.  The same degree of pressure is not felt by nomadic, hunter-gatherer societies.

Domesticated Animals