Two can live as cheaply

Two can live as cheaply as ?

I have a question about how this assumption works. When I
use the assumption that Two can live as cheaply as Two, I get a discretionary
spending number that 10% greater than the assumption that Two can live as
cheaply as One. This is opposite that what I would expect which is
if two can live as cheaply as one, you should have more discretionary income,
not less. Please explain. Thank you.

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