You wrote this in 2023:
So, if adding density can't make housing cheaper what, if anything, can be done about this?
One city that solved this problem 100 years ago is Vienna. During its own extreme housing crisis, it adjusted its municipal tax structure.... It then took the money gained from this source and used it to buy land for non-market housing. It worked with its non-profit housing providers and the city's best architects to build affordable housing—supplying land on a competitive basis to community groups anxious to create affordable communities.
Could you outline the impact this approach has had on rent prices in Vienna?