I'm interested in the "biological needs" argument. Granted, there are some people who simply cannot get by (i.e. survive) on a single income, but that's not many. The other people who "need" the second income are so they can live extremely comfortably, or some might argue, opulantly. I've heard some colleagues make the 2 income argument. They have 2 cars, a large house, satellite (or cable), broadband, play golf regularly, and go out to eat lunch almost daily.
So, does the need to own a Lexus trump the need to breed?
I realize I might be a bit extreme, but just to prove a point.
ETA: I consider myself to be in the "average middle class" bracket, same for the people I work with.
That sounds like upper middle class to me. The median income for family households in the US is about 54 000 bucks. For married couple families, it's about 62 000 bucks. Ok, ball park numbers arguments here, but... Lets say, for simplicity's sake, that half of that is brought in by the women (in reality, it's usually less than that, since on average women make less then men): 62 000/2 = 31 000 bucks. By the way, female householders, no husband present, make, on average about 29 000 bucks, while male householder, no wife present, a rare breed, make 42 000 bucks. I couldn't find any numbers for married couples with one income earner. Besides, they wouldn't mean much: I'm willing to bet that married couples with one income earner can afford to be that way i.e. the single income earner makes quite a lot.
http://www.infoplease.com/ipa/A0104688.html
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