Sizing the homeowner population within the US millennial generation
Company: Google
Role: Product Manager
Category: Product / Decision Making
Difficulty: medium
Interview Round: Other
Estimate how many people in the United States who belong to the millennial generation own a home. Explain how you structure the estimate, label each assumption, and end with a figure and how confident you are in it.
```hint Define the group first
Pin down which birth years count and whether you are counting people or homes, then ask where within the group the share who own is likely to change sharply.
```
### Clarifying Questions
- Which birth years define a millennial for this estimate?
- Are we counting people, so both partners in a co-owned home count, or homes owned by millennial-headed households?
- Does owning include co-owning with a partner or a parent, and homes bought with family help or inherited?
- Should second homes and rental properties count, or only the home the person lives in?
### What a Strong Answer Covers
- A precise definition of the generation and of what counts as owning, settled before any arithmetic
- An equation that runs from the size of the generation to the number of owners
- Labeled, round assumptions for the generation's size and the share who own, each with a rationale
- Correct, unit-consistent arithmetic that keeps people and households distinct
- A sanity check against a second reference point and a final range
### Follow-up Questions
- How would your answer change if the interviewer wanted the number of homes rather than people?
- Which assumption is weakest, and what public data would tighten it?
- How would you project this number five years from now?
Overview: An estimation prompt asking how many people in the US millennial generation own a home. It tests defining the generation by birth years, deciding whether to count people or homes, building an equation from population to ownership with labeled assumptions, and checking the result against national ownership rates.