The Human Supply Chain

Ok I admit this is slightly morbid and insensitive maybe. But it's just hypothetical.

Anyway I've been thinking a lot about supply chains recently, mainly because I just had a test in it today.

I wonder if anyone's ever considered human population as a supply chain. It's got inflows and outflows (births and deaths) and you roughly know the lead times for "orders" (9 months from conception).

I'd be somewhat interested to see a forecast of human population based on examining it as a supply chain. Hmm...