How to market size some very high level market?

market size
New answer on Oct 23, 2022
3 Answers
Anonymous A asked on Oct 14, 2022

For example, how to market size the enterprise application of the software that can reduce manual work in the US?

How to market size the 5G market.

I found this to be significantly harder than some other sizing cases.

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Content Creator
replied on Oct 15, 2022
MBB | 100% personal interview success rate (8/8) and 95% candidate success rate | Personalized interview prep

It's very simple: Do the approach the is the easiest for you given the question.

Are they asking you to estimate something where you don't even know where to begin from the top (maybe you have 0 clue as to the market size of the industry, the GDP of that country, etc. etc.)? Then do bottom-up!

Alternatively, does it seem impossible to do a realistic from-the-ground-up estimation of something (perhaps it requires just far too many steps and assumptions)? Then do top-down!

Fundamentally, you need to take the approach that just makes the most sense in that circumstance. Quickly think about the key assumptions / numbers required and whether you 1) Know them or 2) Can reasonably estimate them. If you can, go ahead!

For top-down you need to segment by the most directly correlated measurements. Age makes sense for motorbikes but not for carrots. Income makes sense for mattresses and iPhones but not for # planes in the sky.

An Example

I answered a Q&A for a great market sizing question here asking to estimate # of electric charging stations in a city in 10 years:

This one could be answered top-down (as I did) by estimating population of the city, # of drivers/ cars, etc. etc.

OR, it could be answered bottom-up by estimating # of stations you see per block (or # of gas/petrol tanks), % increase this might be over time (or # of EV stations that would be needed per gas tank given EV stations take 10 times as long), and # of blocks you'd estimate the city to have.

Take a look here for additional practice!

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Content Creator
replied on Oct 18, 2022
#1 McK Coach by rating & recommendation rate| Honest feedback: no sugar-coating | Success stories ➨

Hi there, 

In case you're still looking for help on this, happy to share a case book with examples that might clarify the differences between these market sizing types. 



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replied on Oct 23, 2022
Bain | EY-Parthenon | Roland Berger |Former Head Recruiter | Market Sizing

The tough part of this is not the market sizing itself, it's considering the multiple application possibilities (only after you start sizing them). 

So this is combining pure problem solving (breaking down a problem into its multiple parts) with market sizing. 

On both situations you need to think about WHO (and WHEN) is using a given service / product and. You need to consider its applications. Only then you can size it. Usually sizing it is about considering the VALUE that it can bring to a specific customer.

Hope this helps!

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Ian gave the best answer


Content Creator
MBB | 100% personal interview success rate (8/8) and 95% candidate success rate | Personalized interview prep
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