Discussion
Assertion: the before-and-after difference measures a project's benefits. Reason: the project is the only thing that changed over the period.
Answer: A
Correct answer: both the assertion and the reason offered are false
A before-and-after comparison attributes to the project everything else that changed over the period - traffic growth, income, the economic cycle. The correct measure is with-project against without-project over the same period, which is why a control or a counterfactual forecast is needed. The reason states the very assumption that fails.
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