Which accounts does the feature actually help?
Heterogeneous effectsHardProblem. A feature has a small positive average effect on consumption, but you suspect it helps some account segments a lot and others not at all. How do you find where it works, and act on it?
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.