Metric-Drop Case: Tracing the Root Cause When Google Search Earns Less

You are a product manager at Google, and revenue from Google Search has gone down. Work out why. Walk through how you would confirm the drop, narrow down where it comes from and identify the cause. ```hint Find the moving part Before listing possible causes, write search revenue as a product of a few measurable parts and ask which of them changed, and in which slice of traffic. ``` ### Clarifying Questions - How big is the drop, over what period, and against which baseline: the previous week, the same period last year, or a forecast? - Did revenue fall suddenly or decline gradually, and does the timing match a launch, an outage or a policy change? - Is the drop global, or concentrated in certain countries, devices or advertiser industries? - Does "search revenue" mean ads on Google's own results pages only, or also ads served on partner sites? ### What a Strong Answer Covers - Clarification of the drop's size, timing, scope and definition before any diagnosis - A check that the drop is real rather than an artifact of data or reporting - A decomposition of revenue into measurable drivers, checked in a sensible order - Segment cuts and a timeline that separate internal causes from external ones - How to confirm the root cause and what to do once it is found ### Follow-up Questions - Suppose query volume and ad clicks are flat but cost per click fell in one advertiser industry. What would you look at next? - If the cause is a ranking change that made results better for users but reduced ad clicks, would you roll it back? - How would you tell a lasting shift in where people search from a temporary dip?