11. The best terms of trade Z could ever hope for are the same as Q's opportunity cost, so all we need to do is determine that.

Since Q's comparative advantage is in MP3 Player production and Z's is in coffee production, we are interested in the best terms for Z to export coffee to Q in exchange for MP3 Players.

From the PPF for Q we can see that their opportunity cost for coffee is 1.5 MP3 Players (120 ÷ 80), so the best possible terms of trade Z can hope for is to trade one bag of coffee for each 1.5 MP3 Players (or 2/3s of a bag for 1 MP3 Player).

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