Is advertising actually worth it for a merchant?
Measure impactHardProblem. A merchant advertises on DoorDash and gets orders "from ads." They ask whether the ads are actually worth it. How do you measure the true value?
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.