Does McKinsey doing market size questions?

Brainstorm market sizing: nearly never -  Creating a bottom up estimation of a market by taking extensive assumptions from your personal experience is very rare in McK cases. Instead of such brainstorming approaches they focus on the below mentioned market sizing via given numbers. 

Market sizing in general: yes absolutely - Having to do market sizing via different routes (e.g., top down or bottom up) is a common part of a McK case. However, the numbers are given by the case via exhibits, interviewer prompts or previous case sections.

Building on Patrick’s response, also note that market sizing is usually embedded within a broader case. It’s very rare to get a standalone market sizing question.

Hey there,

The answer is a strong yes: I would say that roughly 60-70% of McKinsey R1 cases involve some kind of market/opportunity sizing. Most of these are top-down, but tougher interviewers do expect you to handle a more complex bottom-up market sizing (although, more typically in R2)

Please, note that this can mean a combination of a few different things:

1. A case that focuses purely on market entry -- and where market sizing can take up to 30-40% of the time
2. A quick question on the size of our client's market in a different case type
3. The calculation of an investment opportunity, e.g., where you launch a new product and you need to calcolate a P*Q starting from the market size (for example using then some penetration rate
4. The calculation of the client's revenue, similar to the point above

Hope this helps!

Tom

hey! 

as someone who interviewed at McKinsey myself, I can confirm they use sizing mainly to test structured thinking, realistic assumptions, and clean math inside a broader case flow => so only embedded in a case. BCG & Bain love market sizing :) 

Alessa

Hi there, 

Yes, they do. 

They might not be self-standing, as in just a market-sizing question. Typically, they are embedded in the case itself. 

But even if they weren't specifically part of the interview process, I would still recommend you practice them, because they combine so many of the skills that use for other elements of the case: structuring, estimating, aligning with the interviewer, computations, etc. 

If you need any help with this, drop me a line.

Best,
Cristian

As a McKinsey interviewer for 7 years, let me share my 2 cents! :)

Yes, absolutely!

Especially in Round 2. And here's why:

- Round 1 usually taken by an Associate or EM. They come prepared with a structured full length McKinsey case from the Firm Case Library. Very unlikely to be a full on market sizing case

- Round 2 usually taken by an AP or Partner. It is perfectly possible that the Partner or AP did not come prepared with full length exhibits or cases. (especially back when interviews were in-person). So that means    --> They don't have any data off-hand --> Meaning you have to create the data --> Meaning it becomes a de-facto market sizing case! So, YES!

When I interviewed as a candidate with McKinsey, I had a total of 7 cases, of which two were full-fledged market sizing cases (so please do not ignore them, especially in Round 2) - hope that helps!

Cheers
Jimmy

Usually not as standalone cases.

At McKinsey & Company, market sizing is most often embedded inside a broader strategic case. For example:

* estimating market potential

* sizing a customer segment

* calculating demand to support a recommendation

So you still need to be comfortable with estimation, but it’s rarely “how many tennis balls fit in X?” for 20 minutes straight. It’s typically tied to a business problem.