It may be yours.
In the real world, it is not even a definition of less affordable.
Explaining this would be futile.
If wage growth is less than house price growth by even a small amount, eventually housing becomes something which literally cannot be bought by wage earners.
No amount of saving will help if the houses grow faster than you can save. Exactly what we've seen in Melbourne and Sydney.
Seems to be making pretty good predictions thus far.