Gary's Economics claims wealth inequality is at the root of housing unaffordability. Basically as wealth concentration grows, the ultra-rich bid up the assets. See the price of gold doubling in the past few years. Government stimulus is also captured by the richest. It's also a global phenomenon, i.e., every major city is now unaffordable for most people.
https://youtu.be/BTlUyS-T-_4?si=P0mdHxtq1F7DV4jo