I’m not sure that’s true.
It might seem that way because we’re basically at what by modern standards is considered full emplyment, but the key phrase is "modern standards."
However, if you looked at the average American family today and the average American family 150 years ago, I bet you wound find that the average family in 1860s America had more members working, and working longer hours, in order to survive. Today, there are plenty of households that live on one parent’s income — or with one parent working full time and one working part […]
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