If a production possibility frontier is drawn concave to the origin with the quantity of shoes on the X-axis and the quantity of T-shirts on the Y-axis,a movement downward along the PPF reflects:
A)a decreasing opportunity cost of both shoes and T-shirts.
B)an increasing opportunity cost of both shoes and T-shirts.
C)an increasing opportunity cost of shoes.
D)a decreasing opportunity cost of shoes.

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The Answer of If a production possibility frontier is drawn concave to the origin with the quantity of shoes on the X-axis and the quantity of T-shirts on the Y-axis,a movement downward along the PPF reflects:
A)a decreasing opportunity cost of both shoes and T-shirts.
B)an increasing opportunity cost of both shoes and T-shirts.
C)an increasing opportunity cost of shoes.
D)a decreasing opportunity cost of shoes.

If a Production Possibility Frontier Is Drawn Concave to the Origin