How Harvard flunked economics

Isaac Asimov had a similar essay but for population growth. One of the upper limits he reached was that in something under 10k years, the volume of space occupied by humans even if we were packed in as tightly as physically possible into a sphere would need to be expanding at the speed of light.

If anyone wants to track it down, I think it was the one called "Stop!" on the listing here [1], but I might be mixing it up with one of the other population essays listed there.

[1] http://www.asimovonline.com/oldsite/Essays/overpopulation.ht...