An economy can produce the following combinations of goods: 50X and 0Y, 40X and 10Y, 30X and 20Y, 20X and 30Y, 10X and 40Y, and 0X and 50Y. The production possibilities frontier (PPF) for the economy is
A) concave downward because the opportunity cost of producing the 10th unit of Y is greater than the opportunity cost of producing the first unit of Y.
B) a straight (downward-sloping) line because the opportunity cost of producing the two goods is constant.
C) concave downward because the opportunity cost of producing the 40th unit of Y is less than the opportunity cost of producing the 10th unit of Y.
D) a straight (downward-sloping) line because the opportunity cost of producing the 10th unit of X is greater than the opportunity cost of producing the 40th unit of X.
E) a straight (downward-sloping) line because the opportunity cost of producing the 30th unit of Y is greater than the opportunity cost of producing the 30th unit of X.
B
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