• Ben Gutkovich

Remember this!

Updated: Dec 26, 2019

Case Interview is not your typical university exam and there is very little data to learn by heart, however some data sets could be extremely useful. We split these into two types – data that can help you do math faster and data that could help you with guesstimate / market sizing type questions.

For the latter, knowing some basic information about the size, demographics and economy of key world countries, with the emphasis on the country and city you are interviewing in will go a long way to help you solve the market sizing question and demonstrate the interviewer that you are business-savvy and well read.

Many market sizing questions can be solved top-down from the population of a country, and it could be quite embarrassing to ask the interviewer about the population of your own country. Knowing the demographics of the country, will help you solve questions where consumption differs by income.

Here are some basic datasets we’ve collected, with focus on the US. It is worth memorising those.

Data to help you do math faster

Fractions / Percent / Decimal conversion table

Time units (note: in most of the cases, you can and should use rounded figures to simplify calculations)

Data for Market Sizing questions

Population and GDP per Capita of selected countries and regions

Average income by quintile (US)

Other useful data points:

  • Life expectancy – 80 years

  • Size of household – 2.5 (can be rounded to 3)

  • Interest rate on savings (US, 2019) – 1%

  • Interest rate on loans (US, 2019) – 5%

Read our blog post on Market Sizing Questions to learn how to solve this type of questions.

#MarketSizing #Remember #Data

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Consulting Case PRO was started by Ben Gutkovich.

Ben is a former Engagement Manager with McKinsey & Company and an MBA graduate from London Business School. At LBS, Ben secured offers from McKinsey, BCG and Bain. At McKinsey, he led the firm’s recruiting efforts at top UK universities.


Ben helped 100+ candidates secure an offer from top tier consulting firms since leaving McKinsey, and started Consulting Case PRO to give more candidates access to his exclusive interview preparation techniques. 



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