A Skill That Rewards Method Over Memorization

Market sizing questions appear in case interviews, case competitions, and on-the-job strategy work alike. What separates a strong answer from a weak one isn't knowing more facts — it's having a clear, structured approach that applies to any prompt, and the ability to communicate your reasoning cleanly while you work through it.

Approach, Mindset, and Technique

The course covers both top-down and bottom-up approaches — when to use each, when to hybridize, and how to select the right entry point for a given prompt. You'll develop the mindset shifts that prevent the most common traps: over-precision, poor segmentation, and assumptions that fail basic sanity checks. The techniques covered — ratios, penetration modeling, replacement cycles, unit-price logic — are practical and transferable across industries and prompt types.

Six Exercises, Full Walkthroughs

The exercises span taxis, coffee shops, fruit markets, mattresses, internet users, and trees — deliberately varied across durable goods, local services, digital markets, and spatial estimation, and progressively more challenging as the course develops. Each includes a full solution walkthrough so you can compare not just your answer but your approach, building the pattern recognition that makes market sizing reliable regardless of what prompt you're given.