Also, from Wikipedia:
Low estimates suggest a decline
Moderate estimates suggest a plateau
High estimates suggest constant increase
Time will tell, and estimates suggest that the earth can comfortably support ~10bn
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I don't think housing prices have much to do with population increase, but more to do with urbanization (as well as increasing wage gaps).
People are flocking to existing cities, and the more center you are the higher prices are.
This pushes people to the outskirts, which become more urbanized, which spreads urbanization through the same cycle.