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How did the spread of agriculture affect trade?
a. The spread of agriculture made trade unnecessary; people could make and produce all the food and supplies they could possibly need.
b. Neolithic people produced more than they could eat, so they began to trade their food for supplies they could not produce themselves.
c. The spread of agriculture only increased trade in western China, where exports like silk and spices were in high demand.
B) Neolithic people produced more than they could eat, so they began to trade their food for supplies they could not produce themselves.