This question evaluates a candidate's competency in revenue diagnostics, metric decomposition, cohort and segmentation analysis, and experimentation-aware causal reasoning within product analytics.

A consumer fintech/trading platform (e.g., mobile/web app with transaction-fee revenue) experiences a noticeable revenue decline over the last 7–14 days compared to the prior comparable period.
Revenue comes primarily from transaction fees on trading volume (take rate × volume), plus smaller streams such as spreads, subscriptions, staking/custody, and other fees. Seasonality (day-of-week), market conditions, and release/experiment calendars can influence user behavior.
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