Problem
Scenario
You're supporting a grocery delivery business that saw order volume in one major city fall sharply overnight. Leadership wants a fast read on whether this is a demand problem, a supply problem, a product issue, or a data artifact. The city is large enough that the drop matters to company-wide performance, and the change is abrupt enough that normal week-to-week noise is unlikely to explain it.
Question
If our grocery delivery volume dropped by 10% in a major city overnight, how would you go about diagnosing the cause?
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