Your cost per acquisition doubled in two weeks. Walk me through your diagnosis.
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Reveal model answer & level guide
I would first check whether the cost moved or the measurement moved — a broken tag, a consent change, or an attribution window shift explains more sudden doublings than the market does. Then I would decompose it: is it impressions costing more, click-through falling, or conversion rate dropping after the click? Each points somewhere different — auction pressure, creative fatigue, or a landing page or checkout problem. I would also check mix, since a shift in spend toward an expensive segment moves the blended number without anything actually breaking.
- Entry
- Check the obvious: spend, bids, and what changed in the account.
- Mid
- Decompose into impression cost, click-through, and post-click conversion.
- Senior
- Question the measurement itself, and rule out a mix shift before naming a cause.