China's net gain from trade in coal is 120- 100- Price (dollars per ton) 80- 60- 65 40- 20- Oare A B с area D D Quantity

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China's net gain from trade in coal is 120- 100- Price (dollars per ton) 80- 60- 65 40- 20- Oare A B с area D D Quantity (billions of tons per year) area B + D Sc World price Dc
O area D Oarea B + D O Oarea A + B + D zero area A