Mike asks:

> Given most US middle class or wealthier have at least some college and
>  only give birth to 2.1 children or so, how many kids do the PhDs have?
>  "-3"?

Clearly, the number will be larger than zero.

In searching the web, I couldn't find a chart for the developed countries,
but the same phenomenon applies as well for the developing nations (a chart I
did find), but at higher rates of fertility and less education. Nonetheless, the
trends are the same:

     http://www.infoforhealth.org/pr/m17/tableb.html

Wirt Atmar

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