The Olmec civilization's economy was based on
the sharing of resources.
trade with other civilizations.
the use of currency to buy goods.
O available resources and bartering.

Trade with other civilizations.

Explanation:

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increases in demand are shown by a shift to the right in the demand curve. this could be caused by a number of factors, including a rise in income, a rise in the price of a substitute or a fall in the price of a complement.

which the answer is:

b