Lots of interesting discussion here, and there are no easy answers.
Interestingly, I believe the tax advantages of housing helps to create inflated home prices. I disagree with the tax policy favoring houses, as it is not fair to the poor (much of which don't own a home) and increases the cost of buying a house to begin with.
As others point out, regulatory costs (building permits, etc) is a big reason why a lot of builders don't build affordable homes. There is no profit in it.
Interesting discussion on women in the workforce and potential impact it has had on housing. It actually brings up an interesting dilemma I often think about. If you had told the average household 60 years ago about all the technology and modern conveniences that are around today, they would have said holy cow, they're going to have so much free time in the future it's going to be awesome. And yet, it seems we have less free time, and economically, women now have to work to make ends meet versus what occurred 60 years ago.
And don't get me started on low interest rates. It's jacking up the prices of houses and other major investments. I feel like the Fed in recent years is creating an enormous asset bubble and when it pops, things are going to get really ugly. Housing bubble that caused the last recession was the Fed artificially juicing up the economy in response to prior recession in 2001/2002. And now they're doing it again. Interest rates by now should have been raised much higher than where they are today, and now they're actually talking about the Fed lowering interest rates again after they barely started creeping up. There is no tolerance for any kind of pain anymore, but the problem with that is that I think all this does is actually create even bigger bubbles that turn super ugly when they finally burst because of an unwillingness to take any kind of short term pain. In today's climate, I'm not sure the Fed would jack interest rates to combat 70s inflation. There would be no stomach for the resulting early 80s recession in today's world.
Are there any others out there like me that worry that our economy is structurally broken, and the only thing keeping it going is piling on more government debt to keep the wheels turning? Sorry to digress, but it's all connected, and housing is only one component of structurally bigger economic issues facing this country.