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Countries trade with each other when, on their own, they do not have the resources, or capacity to satisfy their own needs and wants. By developing and exploiting their domestic scarce resources, countries can produce a surplus, and trade this for the resources they need.
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the Andes is the primary mountain range in South America
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should in case you see him tell tell the message.
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Control and Prevention of two cases of novel coronavirus, ... they became ill and have been self-isolating at home ever ...