Seth wrote:
Does the research address the issue of uncontrolled illegal immigration?
No. But it does discuss migrants who are uneducated. The research shows that uneducated migrants still make a major economic contribution.
On land in Australia.
I am not Australian, but I have driven over more of Australia than most Australians. Australia is not short of habitable land. There is heaps. For example, the entire top one third of Australia is monsoonal, with massive rainfall over the short (four month) wet season. Living there is not always comfortable, since for those four months it is hot and very humid and wet, but there is no problem with habitability. In the dry season, water can be pumped up from the aquifers that are topped up every wet season. In fact, in the dry season, the climate is delightful
For the other two thirds of Australia, there is much arid or desert land, which is less habitable, but the entire east coast, to a width of some hundreds of kilometers, is perfectly habitable. This area alone could hold vastly more people than now live in Australia.
Some of the arguments about the most expensive land in Australia are confined to the cities, which is kinda ridiculous. If you go away from the cities and inland a little, land is cheap by the standards of Europe.