The numbers don’t lie: The housing crisis is not caused by a supply shortage
(www.policyalternatives.ca)
Yeah and no. In metro area most homes are allowed to divide basement into 2 legal suites, to maximize density. These aren't empty.
Owner above may have a spare room when kid moves out. What I have seen is East and South Asians will often rent a room out, but whitefolk seem to prioritize single family only. That is a Western hangup.
So empty bedroom doesn't really equate to an indendant unit on the market.
Anecdotally we have downsized as the kids moved out. We had 3500sqft place at one time , now in 800sqft condo as empty nesters.