If all countries produce the goods for which they have comparative advantages, all countries benefit with the increased production of goods with no additional resources being used.

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This is the principle of comparative advantage in international trade. Each country specializes in producing the goods for which they have the lowest opportunity cost (the cost of producing something in terms of what you have to give up to produce it) compared to other countries. By focusing on their strengths, they can produce more efficiently and effectively, leading to increased overall production with no additional resources being used. This allows countries to trade with each other, benefit from each other's strengths, and ultimately increase their overall economic welfare.

If All Countries Produce the Goods for Which They Have