[tmnvix]

I'm not exactly sure which rules you are referring to, but if you are alluding to Australia and New Zealand being difficult to emigrate to, I would just point out their respective population growth rates relative to the US (this growth is not due to natural increase - it is immigration that is driving it).

https://www.google.co.nz/publicdata/explore?ds=d5bncppjof8f9...

[diggernet]

I am referring to the points system and income requirements, which give priority to people who are young, healthy, well educated, in demand, and/or wealthy. This ensures that most who are approved will provide substantial funding into the system before needing to draw from the system. As a result, the immigration-driven population growth you point to actually helps support the system.