The scenario of retirees selling in the city for 500K and buying in another location for 300K also relates to the concept of "population growth" (isn't that my title for this thread?).
Anyhow, you and others have correctly pointed out that population growth comprises new-borns and immigration.
In the scenario above the vast majority of the population growth is a result of adult migration.
So these drivers of population growth need a dwelling as soon as they arrive-not after they reach the age of 25 or gain permanent residency.
Instant population growth if you like.
Moreover, also in the scenario above the house size is projected to be less than 2.1, well under the national projected size of 2.42.
Sorry to bore you with all this "micro-stuff" I realise its only central to the specific scenario above.
But it demonstates how if you look past the macro, the picture is much, much different to the scene painted by the commercial media and its ludicrous, negative "experts." But Blind Freddy can recognise their agendas in a heart beat.
I wonder what its like to live in the negative "macro-world?"