Which regression metric would you report for this forecast, and why not MAPE?
Answer it out loud before you open anything. The value of the flags below is in comparing them to what you actually said — including whether you asked about the data before naming a model.
A retailer forecasts daily units sold per product per store. Most product-days sell zero to five units; a few sell hundreds. Finance wants a single accuracy number in a percentage. The current dashboard reports MAPE, which is dominated by products that sold one unit and were forecast at two, and is undefined on the days that sold zero, which are silently excluded.
What it is really testing
Whether the candidate chooses a metric from the cost of being wrong and the shape of the data, and can explain the specific failure of MAPE on low and zero volumes without dismissing the finance need for something interpretable.