How does one improve ability to market size on a real case (not an interview)? what are the best resources that teams use to inform market sizing data?

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Best place to star is really just a shot Gunn approach and see what is out there. We use expert interviews to really narrow the wide net from the beginning. The more you talk to people on the ground, the more trends you’re just going to start seeing to help inform the future of the product and who uses a particular product. From there you just continue to refine and ensure your assumptions you’re making is backed by something credible

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I was told market sizing wasn’t needed when I applied to MB (didn’t apply to B) with respect to questions like “how many pairs of underwear are sold in Chicago each day”.

For gut checking my math calculations and contextualizing them, which is a sister skill to market sizing, I memorized basic facts like: (1) population of US, India, China, Europe, and world, (2) avg household size in US, (3) life expectancy age and breakdown across age groups in US, (4) percent of people in poverty, middle class, and wealthy in US, India, China, Europe.

That said, none of those facts even remotely came up in any of my interviews, so it wasn’t useful.

It’s more about the structure, then assumptions. You can always try to confirm some assumptions with the interviewer as well

Oh lol. Every firm/team has their own way to do things. You can buy industry report and work off of those, or conduct expert interviews, etc …

It’s honestly that not that far off from a market sizing framework you’d make in an interview (at a high level). You can get to more granular drivers on a real case. It’s also a bit of an art though in the sense that you have to balance that with the type of data you can realistically gather in an accurate way.

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