While I wouldn't be surprised that having two wage earners, and introducing a glut of new workers into the pool would certainly increase job competition, I really think that blaming feminism is pretty simplistic - it could be that culturally our desire for more required that we needed the spending power of two adults (not knowing that would hamstring our later earning potential), or it could be that due to a drop in birth rate due to modernization and standard of living increases women simply had less reason to stay home and more time for out of home activities.