Koolau
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I think a general rule of thumb is that household expenses are proportional to the square root of the number of people in them. So, one person can live for about 70% as much as two living together.
That's the method the Congressional Budget Office uses to normalize household income for comparison purposes; the square root of the number of people in the household.
Source https://www.cbo.gov/system/files/201...old-Income.pdf Appendix A, p. 27
I had not heard this before, but it makes a lot of sense. I've lived in households ranging from 1 to 5. It seems to be reasonably predictive in my limited experience. YMMV
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