Did the promo actually drive incremental orders?

Measure impactHard

Problem. A "$5 off" promo ran and orders rose during it. Finance wants to know whether it was worth the subsidy. How do you measure its true impact?

Before you reveal: say your answer out loud, as if you were in the real interview — get your reasoning across clearly first. There is no single correct answer: reading what the interviewer is really after and defending your own thinking is what makes an answer strong.

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