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Anonymous A
on Jun 14, 2025
Europe
Question about

Market penetration

Why is 90% market penetration used in the revenue calculation? Doesn't that mean 90% of customers already own a camera and are unlikely to buy a new one? Shouldn't the focus be on the remaining 10% who haven’t purchased yet?

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Top answer
Hagen
Coach
edited on Jun 16, 2025
#1 recommended coach | >95% success rate | 9+ years consulting, interviewing and coaching experience

Hi there,

I would be happy to share my thoughts on your question:

  • First of all, you are right that the expression is ambiguous. Market penetration shows who is already a customer, even if they may be customers again in the future.
  • Moreover, I would advise you to clarify any unclear assumptions during the case interview, although this is unfortunately impossible with such case studies.

You can find more on this topic here: How to succeed in the final interview round.

If you would like a more detailed discussion on how to best prepare your application files, for your upcoming pre-interview assessments and/or interviews, please don't hesitate to contact me directly.

Best,

Hagen

Mariana
Coach
on Jun 15, 2025
Free CV evaluation | xMckinsey | 1.5h session | +200 sessions | Free 20-min introductory call

Hi there,

It does seem a little ambiguous considering that this is not a recurrent purchase and we’re talking about the percentage of the addressable market that will buy during that year in order to calculate revenues. 
Good question. Always make sure to bring up your POV when your logic is different from the interviewers one, sometimes cases can be interpreted in more than one way.

Best,

Mari

Alberto
Coach
on Jun 14, 2025
Ex-McKinsey AP | Professional MBB Coach | +13yrs experience | +2,000 real interviews | +150 offers

Hi there,

Market penetration refers to customers buying a camera that year. Penetration growing slower year or year means revenues grow slower as well.

Best,

Alberto

on Jun 16, 2025
#1 Rated McKinsey Coach | Top MBB Coach | Verifiable success rates
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