Expert with best answer


100% Recommendation Rate

11 Meetings

27 Q&A Upvotes

USD 189 / Coaching

How common are market sizing questions in MBB interviews?

Anonymous A asked on Dec 02, 2018


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

3 answers

  • Upvotes
  • Date ascending
  • Date descending
Best Answer
replied on Dec 02, 2018
Bain & Co interviewer (~3 years) | MBB-prep focused | Expert: Market Sizing; P&L cases | 50+ coachees at MBB
Book a coaching with Ben

100% Recommendation Rate

11 Meetings

27 Q&A Upvotes

USD 189 / Coaching


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! :)

Vlad replied on Dec 03, 2018
McKinsey / Accenture / Got all BIG3 offers / More than 300 real MBB cases / Harvard Business School
Book a coaching with Vlad

97% Recommendation Rate

344 Meetings

4,559 Q&A Upvotes

USD 319 / Coaching


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.


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

99% Recommendation Rate

243 Meetings

1,226 Q&A Upvotes

USD 319 / Coaching

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

Related BootCamp article(s)

Market Sizing

Market Sizing Cases are used to test your quantitative and reasoning skills. The interviewer evaluates your structure, numbers-handling and business sense.

Important Facts

It's essential to know some key figures regarding geographies, population, economies for your case interviews. We summarized them for you here.

Related case(s)

Your client, large automotive OEM WyCar, has developed its first fully electric vehicle (EV) and introduced it as a pilot on the Austrian market last year. However, sales have been far below the expected numbers. The management has engaged you to support them in understanding the reasons and advise ... Open whole case

Bain Case: Old Winery

Solved 29.0k times
4.4 5 785
| Rating: (4.4 / 5.0)

You have inherited the “Old Winery” from your grandfather, a winery which has been family owned for five generations and can be dated back to the 16th century. Half of the eleven hectares are used to grow white grapes, the other half to grow red grapes. They are grown in the conventional way, i.e. ... Open whole case

Roland Berger Case: Onlinestar

Solved 17.4k times
4.3 5 371
| Rating: (4.3 / 5.0)

Onlinestar, an online retailer of furniture and garden products (core business), has grown significantly in recent years as a result of an expansion of its product portfolio. The company mainly imports goods from Chinese manufacturers but also operates its own production of cat lavatories (special b ... Open whole case


Solved 48.2k times
4.5 5 1497
| Rating: (4.5 / 5.0) |

Nutripremium is a very well-known premium nutrition food company in Europe (€1 billion revenue last year). It is based in Spain and has an excellent market share not only in its home country but also in Portugal, France, Italy and Germany. Nutripremium has two main lines of products: Vitamin-supp ... Open whole case

Children vaccine

Solved 43.6k times
4.4 5 1450
| Rating: (4.4 / 5.0) |

Beyer, one of the biggest pharmaceutical companies in the world, just invented a very reliable vaccine against Chickenpox, a disease that affects children in the age from 2 to 16 years. Beyer came to you wondering what their potential sales in Europe in the first year would be if they launched this ... Open whole case