I started with a population-down approach, segmenting by age and likelihood of owning a bike, then tried to layer in average price points for different bike types.
Start by clarifying whether the estimate is for revenue or units, and whether it includes all bicycle types (e.g., road, mountain, kids, e-bikes). Then use a top-down segmentation by customer segments (e.g., adults, children) and estimate annual purchases based on population, ownership rates, and replacement cycles. Finally, multiply by average price to get market size in dollars, and sanity-check with a bottom-up approach if time permits.
Pro tip: Show that you understand the difference between unit sales and revenue, and mention that e-bikes are a fast-growing segment that could significantly impact the estimate. Also, state your assumptions clearly and offer to adjust them if the interviewer prefers different ones.
Ask whether the estimate should be in units or revenue, and whether it includes all bicycle types (including e-bikes, kids' bikes, etc.) and sales channels (new vs. used).
Divide the U.S. population into potential buyer segments, such as adults and children, and further by usage (commuters, recreational, fitness).
For each segment, estimate the number of buyers and the frequency of purchase (e.g., replacement cycle, first-time buyers) to derive annual unit sales.
Assign a reasonable average price for each segment (e.g., kids' bikes $150, adult bikes $600, e-bikes $1,500) to convert units to revenue.
Multiply units by average price for each segment, sum to get total market size, and sanity-check against known data (e.g., U.S. population, typical ownership rates).
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.