How common are market sizing questions in MBB interviews?

Market sizing
Recent activity on Dec 03, 2018
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Anonymous A asked on Dec 02, 2018


Do you know how common market sizing questions in MBB interview?

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replied on Dec 02, 2018
Bain & Co interviewer (~3 years) | MBB-prep focused | Expert: Market Sizing; P&L cases | 50+ coachees at MBB


Great question!

I might be talking about Bain only, but having a case exclusively focused on market sizing at Bain is extremely unlikely. When we "create" our cases, we have clear guidelines, and market-sizing only cases don't give us a chance to evaluate candidates across all dimensions.
This being said, you can definitely have a market sizing "sub-question" in a P&L or revenue growth case for instance, and I would guess this happens in 10-15% of the time, and certain offices may be more likely to give market sizing than others.

I have also heard that BCG (at least in London) is trying to tweak the format of the first rounds and include necessarily a market sizing there - not sure if this is systematic and if this is the case in other offices.

I haven't heard that McK are necessarily big fans of market sizing, and I expect an approach similar to Bain, you may need to size a market but that would be part of a broader question - again to be verified for the office you're targetting.

Overall, I'd say the best way to know this would be to ask a few consultants from the office you're interested in at MBB and compare their answers.

I hope this helps! :)

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Content Creator
replied on Dec 03, 2018
McKinsey / Accenture Alum / Got all BIG3 offers / Harvard Business School


Quite common among all the three firms. More often as a part of the case than as a standalone case. The actual frequency does not matter - it's just to often to neglect the market sizing cases in your preparation.


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replied on Dec 02, 2018
Ex-MBB, Experienced Hire; I will teach you not only the how, but also the why of case interviews

Fairly uncommon, especially at BCG and McK in my experience. Bain may give them a little more often apparently, but I'd still rate as rather unlikely

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Ben gave the best answer


Bain & Co interviewer (~3 years) | MBB-prep focused | Expert: Market Sizing; P&L cases | 50+ coachees at MBB
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