Why is the US birth rate falling? Children offer a decreasing return on investment :)

2009 ๅนด 10 ๆœˆ 8 ๆ—ฅ   

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I have always been a fan of Ben Stein’s articles. I find this one both intriguing and amusing:
http://money.cnn.com/2009/08/31/magazines/fortune/children_value_benefits.fortune/index.htm