A simple random calculation on the impact of wife on the bachelors expenses ..
Assumptions :
1. You need to get a new place and cant live in a shared accomodation anymore.
2. Send her to school if she wants to study and make purchases on the stuff that people say is required to convert a house into home.
Everyone's situation is different, but what I see is that everyone's rent will increase and savings will shrink until the spouse starts earnings which looks than like "before expenses" !!