Hello, I'm stuck on a few market sizing questions and would really appreciate advice on how to structure the questions. How many truck drivers are in the US? How many airplanes are currently flying across the US?

Hey; I honestly think that both Case in Point and Case Interview Secrets have great sections on Market Sizing that focus on the same principle of creating assumptions and a general formula. Truck Drivers in US: Assumed Population = 320m people Age Distribution = Linear Life Expectancy= 80 years Truck Driving Labour Force Size = 21-60 (or 50% of population) Lower Income Families = 20% Middle Income Families = 50% Higher Income Families = 30% Assumed Truck Drivers are 10% of Lower and Middle Income Families 320m * 50% * 70% * 10% = 11.2m people As for the second question, I'll reuse some