Here's a good example of a market sizing. How many people live in China? A billion. (For a guesstimate, that's close enough to the actual figure of 1.3 billion.) Because the population of China is young, a full 600 million of those inhabitants might be of child-bearing age. Half are women, so there are about 300 million Chinese women of childbearing age. Now, the average family size in China is restricted, so it might be 1.5 children, on average, per family. Let's say two-thirds of Chinese women have children. That means that there are about 300 million children in China. How many of those kids are under the age of two? About a tenth, or 30 million. So there are at least 30 million possible consumers of disposable diapers.
Like many interview questions, there are lots of potential subtexts that might start running through your head when you hear this one come out of an interviewer's mouth. Are they trying to get me to dish the dirt on my current employer?
The "Start Big" approach: If you're not sure where to begin, start with the basic assumption that there are 320 million people in the U.S. (or 30 million businesses, depending on the question).
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