[Paul R.]

"When the birth rate is 2.0 (two children per woman), one married couple supports two grandparents."

I was not contesting that at all -- "my" math confirms it.

The problem comes in at the lower birth rates, such as 0.5: RWM was off by a factor of 2 for a married couple. It (0.5) is still disastrous, of course.

[Paul R.]

Oops, sorry, see post above - did not include you in recipients.