Estimation question

What is the market size of toilet paper in the US?

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

Market sizing using population, consumption rate, and price per unit for a common consumer staple.

Estimate the US population, roughly 330 million people.
Estimate average toilet paper consumption per person per year, for example around 100 rolls a year based on typical household usage.
Estimate average price per roll, for example around $0.50 a roll depending on brand and pack size.
Multiply population by rolls per person by price per roll to estimate total annual market size.
State the result as a range and sanity check against the fact this is a multi billion dollar category in the US.

Breaks the estimate into clear per person consumption and price components rather than guessing the market size directly.
Shows the math, 330 million times 100 rolls times $0.50 equals $16.5 billion, clearly marking each input as an assumption.
Sanity checks the result against general knowledge that household paper products are a multi billion dollar category.

Guessing a market size figure with no visible calculation of population, consumption, and price.
Using an implausible per person consumption assumption with no reasoning given.
Not stating the result as a range or acknowledging uncertainty.

How would you break this down between retail and commercial demand?
How confident are you in the rolls per person assumption, and how would you validate it?