Multiple Choice
Exhibit 2-7 
-The economy can produce 15X and 15Y,10X and 20Y,5X and 25Y,or OX and 30Y.It follows that the production possibility frontier (PPF) is
A) a downward-sloping straight line.
B) an upward-sloping straight line.
C) a downward-sloping convex curve.
D) a downward-sloping concave curve.
Correct Answer:
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