But it's a blunt tool which doesn't do the situation justice, neither for men, not for women. It's beside the point. Women don't really earn less in same profession, at same experience level, unless they took an extraordinarily long maternity leave. If alimony payments are counted as income for the person that…

Bell Systems was the owner of all telephone lines; they didn't do licensing for compatible equipment, they sold their own telephones and it was forbidden to connect anything else, or you might lose your phone line. Thus, acoustic coupling had to be used.