Estimation question

Estimate the sanitizer market in the USA.

Practice this question out loud. An AI interviewer asks it, follows up like a real interviewer would, and scores your answer. Type or speak.

What this question tests

Whether you can build a clear, defensible top-down or bottom-up estimate and state your assumptions explicitly.

Confirm scope: hand sanitizer specifically, annual market size in dollars, USA only.
Choose a bottom-up approach: US population times average bottles bought per person per year times average price per bottle.
State each assumption clearly, such as roughly 330 million people, 4 bottles per person per year post-pandemic normalization, at 3 dollars per bottle.
Adjust for segments: households buy less per person than commercial buyers like offices, schools, and hospitals, so add an institutional estimate separately.
Combine the two estimates and sanity check the total against a rough sense of retail personal care category size.
State the final number as a range, not a false-precision single figure, and name the biggest assumption driving it.

Uses a clean bottom-up structure, population times frequency times price, rather than guessing a total directly.
States every number as an explicit, labeled assumption, such as assuming 4 purchases per person per year.
Separately estimates institutional demand, since offices and hospitals buy at a different scale than individuals.
Sanity checks the result against a known reference point, like total US personal care spend, to catch order-of-magnitude errors.

Giving a single number with no visible structure or assumptions behind it.
Ignoring institutional and commercial buyers, only estimating individual household purchases.

Chapters of the AI PM course that teach what this question tests.