At a minimum, you need to agree around the things that one person in the partnership can’t have without the other person. For reasonably conventional marriages, kids are the key example. With home prices the way they are, home ownership may be another. Monogamy also seems like it fits the description.

Depending on your disposable income, it may be possible to have some dreams, like a sports car or a horse, that are personal treats that the partner doesn’t pay for or care about. With less disposable income, those things might crowd out essentials, though.