Consulting Q&A - Stelle Fragen rund um Deine Karriere in unserem Consulting-Forum

A lot of times when questions like this are asked, the interviewer does not know the answer themself. The aim of market sizing questions is to test your ability to break down ambiguous problems such as number of petrol stations into more concrete elements such as ratio of petrol stations to cars. Once you outline an approach and follow it to it's logical conclusion, you should arrive at what is a reasonable answer

The final step in this is 'sense-checking' to see if the answer makes sense. For example if you find that there are 100 petrol stations in all of France or 10,000,000 those are not reasonable answers. If you realize this you go back to your approach/assumptions and tweak what may have gotten the random numbers. It is less relevant how far off you are (10%, 20%, 50%) vs how logically sound your approach is and whether you manged to pick up on the fact that your answer is far off.

Hi,

It should not be calculated with the replacement theory.

First of all, you can always ask in clarifying questions if we are taking into account the commercial usage.

The approach case by case is different:

For example, once you calculate the household cars you can use your personal experience and mention that every 5th car on the street is commercial and divide the households cars number by 80%

For the Malls and hospitals, you need to calculate the commercial vs non-commercial real estate areas and then apply a different number of fo bulbs per sqm

Best