In 2007, the median annual household income rose 1.3% to $50,233.00 according to the Census Bureau 也就是如果一个四口之家,一个人工作,一个人在家带两个孩子的收入也才5万。如果两个都工作,两个孩子放到day care也5万啊。你以为人人都是年薪50万啊。呵呵