I think you may have a slightly skewed perception of the timeline. 2 income households have been the norm/requirement since way further back than 2013.
Regardless, there are a lot of factors. One of them being that people started to figure out that if the woman also worked, they could afford more toys, bigger houses, nicer cars, etc. This drove the price of these things up due to higher demand. This in turn forced many others who didn’t necessarily want to work into the labor market.
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