Answer:
14th centuries of the third-wave era:
By the middle of the 13th century , the chenghis khan controls the asia from the coast of china to black sea. Beginning with the agrarian civilisation, societies started to connect into large network of exchange is called trade. trade was important from the beginning.
As early 2300 BCE , civilisation in Mesopotamia in Egypt and Indus valley were in commercial relationship. Silk road enable small scale exchanges to expand dramatically , when the silk road is first opened , there has been opportunity for trade , the eastern end of silk road has been unsafe because the Chinese inability to control the nomads of mongols.
<span>A massage is an example of a service that can be purchased.
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