Moving along a bowed-out PPF between milk and cotton, as more milk is produced the marginal cost of an additional gallon of milk:

Moving along a bowed-out PPF between milk and cotton, as more milk is produced the marginal cost of an additional gallon of milk:




A) does not change.
B) probably changes, but in an ambiguous direction.
C) falls.
D) rises.


Answer: D


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