Gday Lindon
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immigration from 3rd world to 2nd or 1st increases the population of the 2nd or 1st but reduces that of the 3rd world.
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Only for a very short while. Once population pressure decreases in the 3rd world, the breeding rate goes up to compensate, until they are back on the edge of the limits controlled by starvation.
Just look at the average ages in the "so called" 3rd world now.
Its massively skewed towards the younger generations who have been produced ( and will continue to be produced ) to fill the vacuum.
Its a truly sad part of the maths, but if life is "cheap" ( and thats a horrible way to describe it ), then it becomes abundant, even if a high percentage perishes along the way.
Our first world birth rates are only down because we can no longer afford to raise children in such a haphazard way.
Andrew