On Wed, Aug 08, 2007 at 10:36:06AM +0100, B. L. Krieger wrote:

> don't quite understand that. countries like india or brazil have a 
> reproduction rate higher than sustainable for these countries. whereas in 

For time being (are you sure about Brazil?). 

http://en.wikipedia.org/wiki/Sub-replacement_fertility

Elsewhere the birth rate is plummeting fast. 
While still above replacement (some 2.1...2.3 children/couple),
the key is the rapidity of the change.  

> europe half the population will soon be older than 60, in india more than 
> half of the population will be younger than 20. so why not let more people 
> immigrate to the old, grey west? i am of course aware that this might cause 

The old grey west would just love it. But it would be an ill service
to the countries, because the birth rate *will* plummet.

Long-term, the birth rate will pick up again, because there are subpopulations
with a very high fertility, though the total is stagnating. So below-replacement
fertility is likely a transient phase.

> changes in both societies. but changes of some sort will be unavoidable 
> anyway.

-- 
Eugen* Leitl <a href="http://leitl.org";>leitl</a> http://leitl.org
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