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Ancient Egyptians were making metal rings which some historians think they used as money.
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In china, rather than exchanging objects like tools and weapons, a system of using miniature replicas of the objects.
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Europeans were using more and more metal coins, made with metal taken from their colonies overseas.
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When somebody give you a pound fora box of tea bags, you have confidence that the pound will buy the same amount goods tomorrow as it does today. Many people use plastic cards called debit cards to pay for things.