Originally posted by @J Scott:
The house pricing index is actually a tool utilized extensively by housing economist at the Federal Reserve. Just about every research publication by the federal reserve that has to do with home price movement, uses almost exclusively the home price index which is produced by a government agency. This isn't some sort of 'hit or miss' home value estimation algorithm by Zillow.
Based on the scope of area and transactions covered and considering that it only looks at repeat sales of the same group of houses and going back as far as 1975, it is one of the most reliable sources of home price movement there is.
By the way, my response to the thread was not to defend investment in real estate or properties as some sort of inflation immune instrument but purely to clarify that the hypothesis (subject of the thread) wasn't/isn't scientifically verifiable with current data. I am also no stranger to economics or economist and there almost isn't any entity with more economist on the payroll than at the Federal reserve.
Regarding income growth, I thought you should have caught this earlier but some clarification is required.
It is using the U.S household income but I had (for some reason) utilized series that had already been adjusted for inflation so a correction is required there.
So the unadjusted US household income growth rate (without accounting for inflation) seems to suggest that the median income grew from $20,712 in 1984 to about $51,915 in 2013 and that about 104.6% in 29 years or 3.61% per year.
Between 1984 and 2013:
Home price growth: 6.16% per year
Inflation growth: 4.37% per year
Household income growth: 3.61% per year
To recap, there isn't credible information going back 30 or 40 years that says 'home prices will never outpace inflation', it actually says that it has. Whether 30 or 40 years is adequate, if I can't find something concrete in the last 30 or 40 years that substantiates a hypothesis, I don't necessarily need to look 100 years.
Information regarding the housing prices index may be accessed here:
https://research.stlouisfed.org/fred2/data/USSTHPI.txt