Real land prices (land values) can only be higher today than tomorrow, if productivity drops, infrastructure gets worse and/or population declines. Market price naturally changes. If you can afford to put money in the bank, you can afford to sit on your land assets. There is only usually just some 1% property tax. Already the average growth in productivity covers that "risk". The problem with Keynes is that he doesn't make the difference between "capital" and "land", even these are very different in nature.
And in fact, housing has, in the US and UK, been grossly overvalued. And that bubble just popped. So prices will go down, and likely stay down for quite a while.
- Jake If you only spend 20 minutes of the rest of your life on economics, go spend them here.