Suppose the 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:

Question

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According to the Cost-Benefit Principle, an individual should take an action if, and only if, the benefits of taking the action are at least as great as the costs. In this case, since the cost of a third glass of soda is zero, Tim should drink a third glass as long as the benefit of doing so is positive.

Suppose the Cost to Tim of a Third Glass of Soda