Brain Teasers & Mental Math
Estimate the annual market size for diapers in the United States.
Model answer
Bottom-up. US births ~3.7M/year; children are in diapers ~0-2.5 years, so installed base of diaper-wearing kids ≈ 3.7M × ~2.5 ≈ ~9M children. Each uses ~6-8 diapers/day → say ~7. Diapers/year ≈ 9M ×…
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