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Eventually, as a result of its protected market encouraging domestic production of a, B attains competitive advantage in a, exceeding A's. Now A buys both its b and a from B, making nothing itself. In order to finance its purchase of a and b from B, it sells natural resources.
B, having developed competitive advantage in a and b, declares that it is for free trade once again and removes the tariff on imports of a into B. A and B are trading freely. B is a developed manufacturing nation, while A is a supplier of natural resources to B.
