That's a different point than what I think the OP was making, and it's not entirely accurate either (except in a relative sense). For it to be completely correc

That's a different point than what I think the OP was making, and it's not entirely accurate either (except in a relative sense). For it to be completely correct, buying power would have to move identically with prices, and it does not. There have been many periods and places in history where the median income earner can afford a top 20% home (but may not choose to), and many other periods where the median income earner can only afford a bottom 20% home, and may instead choose to rent. What we've seen over the past decades is an acceleration of price ahead of buying power, pushing more people into renting, and leading to an accumulation of multiple properties in the hands of a smaller number of wealthier people (or institutions like Blackstone).