Would you approach this question from the population or the land size point of view? Or is there a better angle to approach the question
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    Guestimate: How would you estimate the number of commercial properties in a given city?
                                 
    
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                                                                            Serhat
                                    
                                                                    
                                                    
                                                    
                            on Apr 26, 2019
                    Coach
                                                                        BCG | Kellogg MBA |82% Success rate| 450+ case interview| 5+ year consulting | 30+ projects in ~10 countries
                    
        
        
        
    
    
    
I would use the population although it will be very sensitive to many assumptions.
It looks very difficult to make meaningful assumptions in terms of land size.
Cheers
Serhat
                
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            McKinsey Associate | Coached 80+ MBB candidates | INSEAD MBA & CDI MBA
                    
        
        
        
    
    
    
This is an uncommon question, to be honest.
There are a lot of assumptions involved with both the methods you suggest.
Two points from my side:
- Using population as sizing driver is extremely dangerous, not only in this case; if you had to choose one of the two, go for the second one (trying to extrapolate as a driver an area that you know well and that is COMPARABLE)
 - Try to remember by heart some key numbers that could help you in situations like this one (e.g., # of commercial properties in your target Country, # companies in your target Country by size - small/medium/big): worst case scenario, you can use them to cross-check the values you come up with
 
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