I think that out of a couple, only one should work, so that more jobs are avaible to an increasingly unemployed work force. Of course, there are some couples made from highly skilled professions, teachers, doctor, nurses, etc, where this idea would be foolish to apply, but for the main labour force this probably would work. At the moment, within industrial society, we are finding absurdities where a couple, both working, are living next door to another couple who neither can get a job. I also think that when retirement age comes, that's it, you retire, not carry on working and keeping a job that a younger worker with perhaps a family and on benefit could have.
Whatever partner does the job, is not staying at home, keeping house and raising a family, probably the most important job there is?