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Possessing general knowledge is indispensable, especially for market sizing cases

In a case interview, you must be familiar with basic data about geographies, population, life expectancy, and economies especially for the country you are interviewing for and popular countries such as the US where most big consulting firms are based. Having this knowledge demonstrates that you are well-read and have the potential to be business savvy. Thus, besides being able to solve highly complicated algebraic problems, you should know basic information such as the population of your home country and some key countries of the world. Obviously, it would be embarrassing to not know the population of the country you live in, especially if your client notices this!

Most importantly, you will likely need this information for most market sizing cases, and backing assumptions with known facts such as population data makes the entire exercise of estimation much more plausible and reliable. Knowing such figures can also be beneficial for sanity checks at the end. 

Here are some basic facts we pulled together for you (ideally you should memorize these or at least have an idea of the "order"  if not exact numbers):

 

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Important Facts
Most recent answer on Oct 18, 2019
The best answer (on Oct 18, 2019) is from:
Christine
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Christine
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gave the best answer on Oct 18, 2019
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Hi Radu, Thank you for your feedback and for helping us improve our practice material! We updated the data right away. If you have any more feedback or questions , feel free to contact us. Best, Christine PrepLou ... (read entire answer)
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# Wks per YEar

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Most recent answer on Apr 25, 2021
The best answer (on Apr 25, 2021) is from:
Francesco
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#1 Coach for Sessions (4.000+) | 1.500+ 5-Star Reviews | Proven Success (➡ InterviewOffers.com) | Ex BCG | 10Y+ Coaching
Francesco
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gave the best answer on Apr 25, 2021
#1 Coach for Sessions (4.000+) | 1.500+ 5-Star Reviews | Proven Success (➡ InterviewOffers.com) | Ex BCG | 10Y+ Coaching
Hi there, Yes, in a year there are 52 weeks. However, you can usually ask the interviewer if you can simplify things and use 50, in particular if you are doing market sizing/estimation. It seems PrepLounge reported ... (read entire answer)
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EU has population of about 450m, how did count Europe with 750m?

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Most recent answer on Jun 27, 2021
The best answer (on Jun 18, 2021) is from:
Ian
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#1 BCG coach | MBB | Tier 2 | Digital, Tech, Platinion | 100% personal success rate (8/8) | 95% candidate success rate
Ian
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gave the best answer on Jun 18, 2021
#1 BCG coach | MBB | Tier 2 | Digital, Tech, Platinion | 100% personal success rate (8/8) | 95% candidate success rate
Hi Nina, It's absolutely critical that you improve your knowledge of the world (geography, world events, etc.). The EU is not Europe. The EU is a group of European countries (27 to be exact). Europe has many more.  ... (read entire answer)
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