Suppose that the extra cost to Tim of a third glass of soda is zero because he's at a restaurant that gives free refills. According to the Cost-Benefit Principle Tim should:

A. drink a third glass of soda.
B. drink a third glass of soda if his total benefit from drinking soda is positive.
C. drink a third glass of soda if the extra benefit of doing so is positive.
D. not drink a third glass of soda.


Answer: C

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