Refer to above figure. Albania refused to engage in international trade for ideological reasons. To maximize its economic welfare it would choose to produce at which point in the diagram above? Assume the PA/PB at point a was equal to 1. Given this information, in which good (A or B) does Albania enjoy a comparative advantage?

Now that the Cold War is over, Albania is interested in obtaining economic welfare gains from trade. The relevant international relative price is PA/PB = 2. Albania would thus choose to produce at which point (a, b, or c)? Given this additional information, in which good does Albania enjoy a comparative advantage?