Explain why nations trade with each other.

Explanation :

If the trade takes place crossing the borders of a country between two or more countries , then it is called external trade. A country has to import the goods and services which are not available within the country and can export it's surplus goods and services to other countries. This process helps them fulfill each other's demands as well as earn foreign currency. Nations trade with each other due to the following reasons :

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the mediterranean sea