Final answer:
International trade is driven by factors like production efficiency and comparative advantage, rather than simply selling off surplus production.
Explanation:
Production efficiency is a critical reason for international trade. It allows countries to specialize in producing goods where they have a comparative advantage, leading to increased efficiency and overall economic gains through trade. However, selling off surplus production is not a direct reason for international trade as it focuses more on managing excess output rather than the primary motivation for engaging in trade.
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