Beginner Market Sizing Example With Walkthrough

You'll also find three FREE cases for high-quality practice, with in-depth answers and comprehensive explanations of the thought process behind these answers.

In this video, you will watch me, Julio, an ex-Bainee, interviewing Bruno, ex-McKinsey, with a beginner-level market sizing case. Bruno can get solve this case elegantly, and he would definitely get an offer based on this case. Would you?

I also took the chance to pause the video in several moments to help you read between the lines and understand what's going on in this case. I'd say this video is a react to my own interview, which is kind of funny.

If you're looking to understand what a market sizing case is like and what's expected from you, you're in the right place.

If you want to move on to the next level and learn how to solve any market sizing and estimation case for your management consulting interviews, then I've also got a great deal for you.

00:00 - Introduction and how to learn market sizings
01:10 - Case question
04:04 - Structuring: how Bruno will get to the answer
07:07 - Choosing assumptions: what numbers Bruno will use
19:03 - Calculating: Bruno actually gets to his final answer
21:44 - Reality checking: figuring out if this numbers makes sense
26:07 - Follow-up question and Bruno's answer
28:19 - How realistic is this case?

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Hope the best for your case interview preparation and I'll see you on the next video :)

Julio

[Litt]

Just came here again to say that this and the other video are hands down the best video on market sizing that exist on YouTube. You helped me through the interview! Thanks a lot

[lawsofhumannature]

This guy is a genius, learning from his thought process has helped me so much!

[julianpark]

Love these videos. I work in strategy at a Canadian insurer and it’s so important to continually reality check (aka “sniff test”) our figures

[vio]

Thank you! I only used your resources and practice with case partners and got offeres from all major consuulting firms including all three of the MBB.

[mhkorai]

This is one of the best videos I have ever seen on market sizing case studies. Brilliant!

[Jessica-iird]

Brilliant video, really helped get through the entire case thoroughly.

[fatimakhatibi]

The landscape technique helped me so much. Its like it opened a third eye 😂 thanks guys

[Julia-ieym]

Thanks for this insightful video! I've been binging your content and was excited to see you guys back with a new video.

In the last 'reality check' segment of this video, I was wondering why Bruno used $40 per car per year on brake pads and not $80? If I was following the case right, we assumed 2 axles per car per year is replaced, which would be $80. I am quite confused here and would appreciate if you could help clarify this point :)

[aligasimzade]

Splendid! 1 quick question: why don't you consider the growth rate of the market for break pads? What about break pads for the new cars? So, I think growth in the # of households, population, # of cars per households can increase the cars in use, and so the # of break pads.

[Manonlc]

Amazing video. Helped me a lot preparing for my interviews. Thank you so much !!!

[ginevrafratto]

hello, thank you for the amazing video! could have we directly used the average miles as 50 k miles as it is in between 30k and 70k?

[petermaddaloni]

Good stuff. Would definitely watch more videos like this one.

[ephraimbernhardt]

Thanks for this nice video which is a nice add-on to your course!
I have a question regarding the scope of the case: Don't you need to consider the brake pads installed in new cars as well as an additional contribution to this market?
Thanks a lot in advance!

[alisherzhakaibekov]

Awesome video. However, why did we only consider the replaced brake pads on active cars? There are also break pads bought by automakers and installed on new cars, i.e. straight from the factory. Shouldn’t we have considered those too?

[AbiNdikum]

For the follow-up question portion, can you please explain why we multiplied $16B by 2 and then divided by 3 to find the difference between being replaced ever 2 years vs every 3 years?

[ivelkroezen]

I have one problem with the "Times replaced per year" calculations. If you decide to segment the users based on being commuters/non-cummuters, I would argue that taking a blanket 360 days a year is not valid. Commuters typically work 270 days per year - vacation days. Thus I would say that for the other 95 days, these commuters would be non-commuters.

[rahuliyengar]

Hi Julio and Bruno!

I firstly want to thank you both for your excellent resources!

I am a 4th year engineering student at Oxford, and recently decided to shift into a management consulting direction as I am quite a lot more interested in applying structured problem solving to business rather than purely technical questions. I have been fortunate enough to receive a 1st round interview at Bain (London office) which is scheduled for next monday (the 14th) and have had a panic frenzy the past week as I realised I have so much ground to cover which most candidates have probably been practicing and honing for months at least!! Your free course outlining not only how to structure frameworks but more importantly how to think and approach questions has helped me immeasurably and has saved me a lot of time. I by no means feel remotely ready but I do feel distinctly better than a week ago!

I have been reading your helpful emails and generally scouring through case study resources, trying to apply some of the methods I have developed using your resources in tandem with the victor cheng book and my general analysis style - it has been hard work though as I am yet to get to a stage where I feel comfortably in my own ability to analyse. I feel like a danger as well is to just snowball with case after case. When you go through the solutions it seems so obvious and easy, and you feel like the next time you'd be able to get that, but in reality the whole skill is being able to ask simple questions in a rigorous, structured, and blanced way to bring clarity to vague open-ended questions, something which I don't believe you can gain by just doing 1 million cases - and I hope this is true as I don't have the time to do so!!

My dad is a CEO, and watching him effortlessly analyse these case studies having never done one before can be quite annoying! Despite not having the formal structured issue tree, his analysis hits every box and then some, and I just know that if he was doing this interview he would pass with flying colours with 0 prep. It has however highlighted to me that the skill on display is truly your ability to think 'like a consultant/CEO' which of course an undergraduate is not expected to do to the degree that a professional consultant will be able to, but it is still a good indicator of whether or not you are suited to this profession.

I find my intuition is good, I am a thoughtful analytic person. Where I am frustrated with my progress is in my ability to structure my brainstorming into MECE categories. Furthermore I tend to overcomplicate situations - examples being with case study math where I sometimes approach it like a market sizing question with penetration rates etc. I am solid at the actual maths, but often leap right into something convoluted unnecessarily. Finally and most importantly, I just don't have the confidence that comes with experience. I haven't gone through the internship interview process last year like most candidates, and have had roughly 1 week of case study prep from scratch. I believe in my abilities but there isn't always a substitute for time and experience.

I would greatly appreciate any advice you would have to someone in my situation. I have been, and am more than willing to put in as much work as physically possible, however working hard is never as effective as working hard with a clear direction. If you have any coaching sessions by the way I would be very interested!

I feel like opportunities like this don't come around too often. I am at an important junction in my career, and I really believe this to be a strong career step for me. I am not desperate to be a Bain consultant by any means - my long term goal is to surpass my dad and leave a mark on the corporate world as a top CEO, and I am fully aware that there are so many paths that lead to this, not just this one career and company. I do however feel like this is a strong fit for me, is in line with my long term goals, and is something I can see myself being very good at!


Once again thank you so much for your support to candidates like myself. I know I speak for the others when I say that your resources are very well thought through, logical, and easy to follow, with a clear focus on helping us go from memorisation merchants, to properly thinking through these case studies in a way that would actually be applicable in a business setting!!

Best Regards,
Rahul

[mike-ykyk]

Love your content. I was wondering about how to get from being a business analyst to MBB consulting?

[thanhnguyenminh]

Great content! I have one question, since cars are also durable goods, shouldn't we consider the replacement time of cars to calculate the number of cars in a year? That way the number of cars might be lower and hence the brake pads as well

[MRC-hwrh]

Just something I noticed:

The interviewer did not explicitly mentioned that he was talking about the aftermarket/replacement brake pad market size, right? The candidate also did not ask that as a calrifying question.

How would you calculate for the B2B suppliers that sell brake pads for the auto makers?