1. Land is a limited resource. 2. Property improvements last for a very long time, and are incrementally improved. 3. The buy-in price is relatively high, so only very interested parties get involved. 4. It's a home for goodness sake, why would you not call it an investment?
Society's expectation that housing is a good investment results in people taking on significant debt to buy increasingly expensive homes. The consequence is that homeowners have a huge incentive to suppress the construction of additional housing, to inflate the values of their homes. And when housing prices do fall, people's financial lives are ruined. Contrast metros like SF, Portland, and Seattle with places like Tokyo where homes can be bought for < $400,000. A big part of this is that housing is expected to be a depreciating asset: https://www.youtube.com/watch?v=iGbC5j4pG9w
What contributes most to increased value?
What are economic rents?
What is the perfect tax?
What is the land value tax?