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: : : HI; dears: : : : I am a international student and studying in the U.S.A. : : : right now. This term, I take Economics cl and got a : : : question from my teacher, It is : : : : "Explain how the PPF exhibts the concept of scarcity, : : : opportunity cost, choice and Effciency." : : : He asked 5 paragraphs and also required well structure : : : and organiezd. Please help me!Even though I got some : : : ideas, I still don't have confidence. I really appreciated : : : you. : : : Jack

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