Consulting cases · The case archetypes

Market sizing, and deciding whether to enter

Sizing questions have no data in them, which is the point — you are being watched build a number out of assumptions you can defend. This lesson covers the five-step sizing method, top-down against bottom-up, the replacement-cycle trick for durable goods, and then the entry decision that a market size exists to serve.

25 min read Full lesson in the app Patterns: top-down-vs-bottom-up, replacement-cycle, tam-sam-som

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Before this: case-math-without-a-calculator

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Sizing questions have no data in them, which is the point — you are being watched build a number out of assumptions you can defend. This lesson covers the five-step sizing method, top-down against bottom-up, the replacement-cycle trick for durable goods, and then the entry decision that a market size exists to serve. This walkthrough runs about 25 minutes, with runnable code you can edit and re-run as you read. A new account gets 7 days of Pro free, no card required.

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