I've been told repeatedly by people who have a vested interest in maintaining high housing prices that supply and demand don't work at all, ever, for any reason, and high prices are no reason to build more housing. How do I reconcile these facts?!?

Well, that will work in a 1M people city, but in larger ones you also have to fix transit.

Another impossible problem, that nobody has ever been able to discover the solution is to build mass transit. Maybe one day people will manage to solve it.

Building the house is the easiest part of building a house.

The trick is in creating new supply when faced with:

* Existing land/property owners who dont particularly want to give up their land.

* Property developers who would rather flog one ultra luxury unit to a foreign buyer than 3 to somebody on a median income.

* NIMBYs with multimillion dollar mortgages terrified that denser housing will push them into negative equity.

There is abundance of housing. It's just that people want to live in big metro areas that have extreme concentration of economic opportunity and amenities.

I don't understand how transforming every urban area into Kowloon Walled City will solve that unless your plan is to make it so dense that people will finally find it undesirable to live there?