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Case Fundamentals
Consulting & Strategy

Market Sizing II

CaseMedium~30 minDesigned by experts

About this interview

A case interview on Case Fundamentals, pitched at the medium level. A voice AI interviewer leads the conversation, adapts its questions to your answers, keeps you on topic, and afterward gives you honest, specific feedback on where you were strong and where to improve. Expect roughly 30 minutes.

What you'll be assessed on

Apply asset-based / installed-base decomposition and replacement-rate arithmetic (stock divided by service life) as an alternative to demographic-funnel market sizing
Distinguish a stock question from a flow question, and correctly combine two independent demand streams into a single total rather than collapsing them into one funnel
Recognize how a scoping decision (what counts as a qualifying asset or building) materially changes the resulting market size, and state that boundary explicitly before calculating
Narrate multi-step arithmetic in short, spoken checkpoints and produce a spoken sanity check on the final combined figure
Surface the strategic insight embedded in a decomposition -- which of two segments is actually larger or more durable -- rather than stopping at a single top-line number

What to expect

Size an annual unit-volume market for a B2B industrial durable good -- a step up from simple demographic-funnel consumer market sizing.

You'll need to separate an existing installed base of assets from a new-construction flow, apply a multi-decade replacement cycle to the installed base, and combine two independently-calculated demand streams into one defensible total.

Expect follow-up questions that test whether your structure came before your arithmetic, whether you can sanity-check a multi-step calculation out loud, and how your estimate would shift if one of your assumptions were off.

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