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Trade is simply the trading of something for something else. This can be one good for another good, one good for money, one good for a service, a service for a good, money for a service, etc.

And for how it helps them; well consider some civilization have too much of crops, rice or anything. What they will do? They will either store or sell it expecting money or wealth or exchange it with other goods.

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14y ago

What else can I help you with?