Which theory helps to explain why many nations trade with less-developed or least-developed countries that do not hold advantages in any type of production?

Question

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Comparative advantage theory suggests that even if a country lacks an absolute advantage in any type of production, it can still benefit from trading with other countries if it has a comparative advantage in producing a particular good or service at a lower opportunity cost than other countries. Therefore, many nations trade with less-developed or least-developed countries based on their comparative advantages, despite not holding an absolute advantage in any type of production.

Which Theory Helps to Explain Why Many Nations Trade with Less-Developed