Though money isn't everything money plays a large role in the relationship of husband's and wives. Both of them come from different backgrounds and as such each have a different spending style. There was an article written by  Michael De Groote about downsizing from a dual to a single income, and one of my favorite parts of it was there was a couple that talked about how when the they decided that the wife was going to stay home and take care of the children it wasn't a big deal for them because though they both had jobs they were only living on his income. Every cent that she earned went into a savings account so though she eventually quit they still had the same income as when she was working, it's ingenious. If we can learn healthy spending and saving habits than we will be that much better off in our marriages.