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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 a potential to be business savvy. Thus, besides being able to solve highly complicated algebraic problems, you should know basic information such as population of your home country and of some key countries of the world. Obviously, it would be embarassing 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. Having knowledge of 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):

Population
World total 7,7 b
China 1,4 b
India 1,3 b
Europe 500m
USA 320m
Indonesia 270m
Brasil 210m
Russia 145m
Japan 130m
Germany 83m
UK 67m

Last updated: 10/18/19

Time

Days / year 365 d
Days / 3 years 1000 d
Weeks / year 50 w
Hours / week 168 h
Seconds / hour 3600 s

Country/Region GDP (in trillion $US)
World 85,804,391
1 United States 20.580
2 China 14.216
3 Japan 5.749
4 Germany 4.555
5 France 3.081
6 United Kingdom 3.039
7 India 2.972
8 Italy 2.442
9 Brazil 1.847
10 Canada 1.820

(Source: Wikipedia, last updated: 10/18/19)

Fractions Percent Decimal
1/5 20% 0,200
1/6 17% 0,167
1/7 14% 0,143
1/8 13% 0,125
1/9 11% 0,111
1/10 10% 0,100
1/11 9% 0,091
1/12 8% 0,083
1/13 8% 0,077
1/14 7% 0,071
1/15 7% 0,067
1/16 6% 0,063
1/17 6% 0,059
1/18 6% 0,056
1/19 5% 0,053
1/20 5% 0,050

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Christine gave the best answer on Oct 18, 2019 - 1 answer
PrepLounge Community & Junior Marketing Manager

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... (more)

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