You can't A/B a price change — how do you measure its effect?
Causal inferenceHardProblem. Twitch raised a subscription price in some regions. You can't run a clean A/B on price (it's live, and randomizing what people pay isn't feasible). How do you measure the causal effect on revenue and subs?
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.