This is a great article on msnbc that discusses how finances have changed since the 70's. In particular there is a great graph showing the differences in taxes, and lifestyles between now and then.
http://www.msnbc.msn.com/id/21309318/?GT1=10450#storyContinued
Woman entering the work force did not improve the families finances. Instead it opened the door for more taxation and a higher cost of living.