In the 70's it was common for just one member of a family to work, because if another person worked, all their dollars would be taxed at the 50-70% rate. Even

In the 70's it was common for just one member of a family to work, because if another person worked, all their dollars would be taxed at the 50-70% rate. Even as late as the 70s, it was common for just one member of a family to work because that person was the husband/father, and the wife/mother was strongly expected (and, through the way the employment system worked, often more or less forced to) stick to housework and childrearing.