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Trade and Commerce the city-dwellers did not produce food grains they had to take crops from the farmers. In exchange for this, the city-dwellers used to provide the farmers with other necessary things as tools, sickles, celts, etc. Thus began trade and commerce in the Copper and Bronze Age. At first all buying and selling was done by barter, that is, by exchange of goods. Subsequently, money became the medium of exchange.
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